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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

728.5+square root of 12.25+7.947

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.

sir made the payment today for SBI PO MAINS 10 mock papers for 149/- via my net banking...

payment go through through and the amount get deducted from my account.

still did't get any confirmation message on my email... please check that and reply me

worst mock ever for sbi po pre and main.please no one enroll in it 

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