1.

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 is

Answer» Correct Answer - C
Number of value ……………….
N is divisible by 11, if
`(b+3+7+a+8) - (1+9+2+7) = a+b-1` is divisible bt 11
`i.e. a+b = 1 to 12`
`:.` number of values of a `a+b` is 2


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