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The sum of the coefficients in the expasnio of `(x|y)^(7)` is ________

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The sum of the coefficients in the expasnio of `(x|y)^(7)` is ________
A. 119
B. 64
C. 256
D. 128
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Correct Answer - D
Put x=1 and y=1 in the given expression
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