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What is the best way to approach DI questions? As they tend to be calculation extensive, what is the best strategy to optimise the time?

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Find the digit in 469th place from right of 90^468

the rightmost non-zero digit of the number 20^2520?

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find minimal vvalue of the expression a^6+b^6 if a^2+b^2=1?( if ur answer is 1/4 tell me how 3a^2b^2 becomes 3/4)

A can do a piece of work in 10 days while B can do it in 15 days. They begin together but 5 days before the completion of the work , B leaves off. find the total number of days for the work to be completed?

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The sum of all natural numbers less than 101 which are co-prime to 2, 3 and 5??

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