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Question
1×5 divisible by 3?
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Solution
1×5 is divisible by 3
⇒ 1 + x + 5 is a multiple of 3
⇒ 6 + x = 0, 3, 6, 9,
⇒ x = -6, -3, 0, 3, 6, 9
Since, x is a digit
x = 0, 3, 6 or 9
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