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The value of x for which the unit digits...

The value of x for which the unit digits of the following two expression `(1 + 2 + 3 + 4 + 7)^(x^2 + x)` and `(11 xx 11 xx 13)^(x)` are same for `x > 0`.

A

1

B

2

C

3

D

none of these

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The correct Answer is:
B
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