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2015-10-03T11:18:52+05:30

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X = 0 or 9..this is bcuz on putting the values of x in the number and then adding all the digits in the number,,we obtain an answer which is divisible by 9..
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2015-10-03T11:57:07+05:30

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For 37643x4 to be divisible by 9, Sum of the digits should be divisible by 9.

Sum of digits = 3+7+6+4+3+x+4 = 27+x
(27+x) will be divisible by 9, if x is divisible by 9.

So x can be either 0 or 9.
If x=0, 27+0=27, which is divisible by 9
if x=9, 27+9=36, which is divisible by 9

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