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Doubt Clearance Thread: UPSC 2021



In Q.13 , is the statement 1 correct? 

Which one to consider to answer this? Kasturilal case of 1965 or Common cause case of 1999 ?
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@Voyager statement 1 is correct according to kasturilal case


But subsequent judgements of the Supreme Court say the govt can be sued even in the sovereign functions. So I'm confused .

Besides I have an another doubt . What are sovereign and non sovereign functions?

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@Voyager statement 1 is correct according to kasturilal case


Ok, so detailed explanation is given in DD Basu.

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@forumiasacademy 


Is there a weekly compilation of Factly? Especially for this month of September .The weekly compilation has only mains related  wise  content . 

If yes please provide with the  link ( as I could not get it)and  if there is no such , then  could you please compile it for us . It would be much helpful. :pray:

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@forumiasacademy 


Is there a weekly compilation of Factly? Especially for this month of September .The weekly compilation has only mains related  wise  content . 

If yes please provide with the  link ( as I could not get it)and  if there is no such , then  could you please compile it for us . It would be much helpful. :pray:

Though there is an option of deleting paragraphs and then taking a printout of 9 pm brief, it is time consuming.

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Is Casio watch ( the one which has basic feature of setting alarm) allowed in exam hall? 

If not , analog watches are  the  safe ones



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Please help
Using the digits 2,3,4,5 and 6 find the sum of all 5 digit numbers that can be formed such that no 2 digits are the same.
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D503said

Please help
Using the digits 2,3,4,5 and 6 find the sum of all 5 digit numbers that can be formed such that no 2 digits are the same.

5333280?


Yeah , but what is the trick here? 

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D503said

Please help
Using the digits 2,3,4,5 and 6 find the sum of all 5 digit numbers that can be formed such that no 2 digits are the same.

5333280?


Yeah , but what is the trick here? 

(2+3+4+5+6)×11111 ×  what to multiple here ? Why is it 4 factorial?

3.2k views

D503said

D503said

Please help
Using the digits 2,3,4,5 and 6 find the sum of all 5 digit numbers that can be formed such that no 2 digits are the same.

5333280?


Yeah , but what is the trick here? 

(2+3+4+5+6)×11111 ×  what to multiple here ? Why is it 4 factorial?

how many numbers can be formed with 6 as last digit ? 4*3*2*1 or factorial 4. You repeat this 5 times to get sum of last digits which comes out to be factorial 4 *(2+3+4+5+6)  = 480. This will happen at every position. So last digit will be 0 next digit 480+48.... And so on

Thank you very much , now understood

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Not able to decipher the pattern. Is there anyway to get the pattern easily? I'm ended up giving too much time but still not able to see what's a pattern in these types of questions. This type of question was repeated in both the year 2019 and 2020.

I fill the pattern with each option and then see which among the four has repeating pattern. 

Even after this if it takes time , I leave the question.

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how one will proceed ? Not able to grasp this question. Main to answer isme wo laa raha hun jo ki options main hi nahi hai😅

1 digit number ->1-9 =9

2 digit number ->10-99= 90*2=180

3 digit number->100-999=900*3=2700

Total digits used till now = 2700+180+9=2889, total digits to get=3089 =>remaining digits= 3089-2889=200

=>total 4 digit number= 4*x=200 =>x=50 =>50th 4 digit number is 1049 which is the answer.

Beautiful explanation

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Anyone seeing large difference w.r.t. CSAT scores?

I couldn't see mine as I had applied for IFoS too

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Pls explain what is the logic behind this ?

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@Steph_Curry @musk Thank you.

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The answer to Q.no. 74 is 45.375?

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@Voyager is it B? 
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Yeah can you pls explain that tree diagram? 

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Thank you thank you 

@Rashmirathi @Hououin_Kyouma @captainhaddock @Purplesunbird 

I had taken 600 three times instead of 200! May be mind needs some rest .

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I was expecting 95 , but my actual score is 81
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