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Question
7×34 divisible by 9?
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Solution
7×34 is multiple of 9
⇒ 7 + x + 3+ 4 is a multiple of 9
⇒ 14 + x = 0, 9, 18, 27,
⇒ x = -1, 4, 13,
Since, x is a digit
x = 4
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