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Doubt Clearance Thread: UPSC 2021

under permanent settlement who were the real owners of land-zamindars or britishers
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Which one of the following observations is not true about the Quit India Movement of 1942 ?
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@RAGNAROK why not A option. 


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@sjerngal yes its 2011 upsc pyq. 


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can anyone share link of official upsc answer key of 2011
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@Shailputri thanks


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how does 5th schedule and 6th schedule of constitution have a bearing on education?

2.6k views
Any tips regarding how to score well in mocks. I Know upsc paper is different from mocks but scoring less in mocks shatters your confidence. Plus seeing people scoring 110-120 makes you question your preparation whether you are doing it right or not. 
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What is the remainder when 51 x 27 x 35 x 62 x 75 is divided by 100?

(a) 50 (b) 25 (c) 5 (d) 1

how to solve this?


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@mehuifs but answer is 100

explaination is this-The expression is: 51 × 27 × 35 × 62 × 75 (51 × 27 × 35 × 62 × 75) / 100 = (51 × 27 × 35 × 62 × 3) / 4 = (51 × 27 × 35 × 31 × 3) / 2 So, we need to find the remainder when 51 × 27 × 35 × 31 × 3 is divided by 2. The value of 51 × 27 × 35 × 31 × 3 must be an odd number, as it is a multiplication of all odd numbers. Hence, when it is divided by 2, we will get 1 as remainder. But we cancelled out 50 earlier. So, the remainder when 51 × 27 × 35 × 62 × 75 is divided by 100 = 1 × 50 = 50 Hence, the correct answer is option (a). 

not able to understand why 50 is coming in end

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@ArchAngel96 2nd video's method is good..thanks


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If you have 2 straight sticks of length 7.5 feet and 3.25 feet what is min length can you measure. (PYQ2020)

A).05 FOOT  

B).25 FOOT

C)1FOOT

D)3.25 FOOT

how to do this question 

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@D503 so your method is wrong?


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@AureliusM is it a software or malware


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@sjerngal thanks man


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a printer numbers the pages of a book starting with  1 and uses 3089 digits in all. How many pages does the book have?
a)1040
b)1048
c)1049
d)1050
can someone explain how to do this type of ques
3.2k views
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