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how to apply the concept of "divisibility by 37" for the following question.

4 is written 3400 times side by side to give a big number i.e. 44444.........444(3400 digits). What is the remainder when divided by 37?

Why can't I take Sectional tests more than 1 time?

I could not understand the solution of "Number system test 12" question number 4

a+b=220

number of solutions, such that a and b are coprime to each other??

how to generalise this question??

Pls explain 

Please explain the concept of  combining remainders

Please can you organize a session on how to solve parajumbles effectively ? If possible then for RC also as Verbal is really a deciding factor nowadays in CAT.

why kattapa killed Bahubali ???please someone tell me ..i can't go to theatre as the tickets are too costly

How to improve verbal skills,which is the best way to prepare for the same

I am new to CAT, so guide me how to start with.