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Questions  

The number of terms in the expansion of  x2+6x+9 )30 is 

a
31
b
61
c
91
d
none of these

detailed solution

Correct option is B

Use x2+6x+930=(x+3)60

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The coefficient of x7 in the expression (1+x)10+x(1+x)9+x2(1+x)8++x10 is


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