Check what the result would have been if Sundaram had chosen the numbers shown
below.

    Q2. 39

Answers (1)

39 + 93 = 133 = 11*12 = a multiple of 11

this can be explained by 

(10a + b) + (10b + a) = 11a + 11b = 11 (a + b)

Here a = 3 and b = 9 

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