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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.

Regarding dashcat 5,i felt that the quant level was a bit above cat level,keeping in mind the difficulty level of quant questions coming in cat in the recent years.

pl find the number of zeros in following

25*30*35*35*40...........*1500