Q4 of 42 Page 17

If is divisible by 11, find all possible values of a + b.

For the number to be divisible by 11


the sum of digit at odd place that is a +b and the sum of digit at even place that is 4 +3= 7 and their difference = (a + b)- 7 should divisible by 11


⇒ (a+ b) -7 = 0


or (a+ b) -7 = 11


⇒ Thus the possible values of a + b = 7 or 18


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