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Consider the number `N = 8 7 a 2 7 9 3 1 b` , where a , b are single digit whole numbers. The least value of a for which N is is divsible by 12 is |
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Answer» Correct Answer - A The least value ………….. N is divisible by 12, if N is divisible by 3 as well as by 4 for divisiblity by 4, we have `b = 2,6` For divisibility by 3, we have `8+7+a+2+7+9+3+1+b= a+b+37` is divisible by 3 i.e. `a+b+1` is divisible by 3 (i) when b = 2, N is divisible by 3 if `a = 0, 3, 6, 9` (ii) when b = 6, N is divisible by 3 if `a = 2, 5, 8` `:.` least value of a is 0 |
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