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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. Number of values of a + b for which N is divisible by 11 isA. `0`B. `1`C. `2`D. `3` |
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Answer» Correct Answer - C Number of values ………… N is divisible by 11 if `(b+3+7+a+8) - (1+9+2+7)=a+b-1` is divisible by 11 i.e. `a+b = 1 or 12` `:.` number of values of `a + b` is 2. |
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