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eg

9856

we add 9 and 5

we get 14

then we add 8 and 6

we get 14

then we subtract the both sum 14-14

we get 0

if the result is divisible by 11 it is divisible

since 0 is divisible by 11 it is divisibleby 11

for eg:- 1331

The sum of even places=4

the sum of odd places = 4

diff: 0

So , the number is divisible