Question

test the divisibility of 20391 by 7 and 11​

Answer 1

Answer:

yes it is divisible by 7 but not bt 11

Answer 2

If the difference of the sum of its digits at odd places and sum of its digits at even places is either 0 or multiple of 11 then the given number is divisible by 11

8790322

Sum of the digits at odd places =2+3+9+8=22

Sum of the digits at even places =2+0+7=9

Difference of the two sums =22−9=13

∴8790322 is divisible by 11

Hope this will help you...

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