Which of the following numbers is divisible by 11?
(a) 1111111
(b) 22222222
(c) 3333333
(d) 4444444
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Solution
(b) 2,22,22,222
In 2,22,22,222, the difference of the sum of alternate digits 2 + 2 + 2 + 2 = 8 and 2 + 2 + 2 +2 = 8 is zero.
Hence, the number is divisible by 11.