Question

For what value of m is the number 7m42876m is divisible by 11

Answer 1

Now taking the test of divisibility for 11 we have to use alternate method of using positive and negative numbers.

So 7 - m + 4 - 2 + 8 - 7 + 6 - m

From this we get 16 - 2 m

From the given values by substituting m as 8 we get 16 - 2(8) = 16 -16 = 0.

hence m = 8

So the number 78428768 is divisible by 11.