What is the value that must be assigned to A so that the number 391A6922 is divisible by 11?
3
Divisibility rule for 11: the difference between the sum of digits at odd positions and the sum of digits at even positions is a multiple of 11.
For 391A6922, sum at odd places (from the left) = 3 + 1 + 6 + 2 = 12, and sum at even places = 9 + A + 9 + 2 = 20 + A.
Difference = 12 − (20 + A) = −(8 + A). For this to be a multiple of 11, we need 8 + A = 11, giving A = 3.
Hence, the answer is 3.
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Which of the following is/are correct?
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2. S is always divisible by 9.
select the correct answer using the code given below:
