1.

The number of distinct terms in the expansion of \[{{\left( x+\frac{1}{x}+{{x}^{2}}+\frac{1}{{{x}^{2}}} \right)}^{15}}\]is/are (with respect to different power of x)

A. 255
B. 61
C. 127
D. none of these
Answer» C. 127


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