13y48 is divisible by 9 the answer is
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number is divisible by 9, if the sum is a multiple of 9 or if the sum of its digits is divisible by 9.
Consider the following numbers which are divisible by 9, using the test of divisibility by 9:
99, 198, 171, 9990, 3411.
(i) 99
Sum of the digits of 99 = 9 + 9 = 18, which is divisible by 9.
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