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Jayati Dinesh Bharadwaj Grade: 10
        

number of values of 'a'(from 0 to 9) for which the no N = 2345631143a4 is divisible by 12 is:


0, 1, 2,more than 2


i know the ans is 2.. plz explain.thanks in advance

6 years ago

Answers : (2)

AKASH GOYAL AskiitiansExpert-IITD
419 Points
										

Dear Jayati


As N is divisible by 12 or I can say divisible by both 3 and 4.


For divisibility by 3, sum of digits shuld be divisible by 3


sum of digits=36+a


so a can be 0,3,6,9


For divisiblity by 4 last two digits shold be divisible by 4


So a can be 0,2,4,6,8


To be divisible by both a=0 or 6


hence 2 is the answer


All the best.


AKASH GOYAL


AskiitiansExpert-IITD


 


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6 years ago
jagdish singh singh
168 Points
										

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6 years ago
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