Question

find a+b if 75a6b38 is divisible by 11
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Answer 1

Answer:

a+b=10

since the divisibility test of 11

is that the alternating sum of the digits of the number should be divisible by 11

therefore

7 - 5 + a - 6 + b - 3 + 8

a+b+1 should be divisible by 11

and lowest multiple that can have its sum expressed as sum of single digit numbers

a+b+1 = 11

a+b=10