Solve this: Q If the co - efficient of x4 in the expansion of 1 - x + - Maths - Binomial Theorem

Question

Solve this:

Q If the co - efficient of x4 in the expansion of 1
  -   x   +   2 x 2 12   is   n + 2 C
r + 1   +   r   ,   n + 1 C r   +   a
C r , then the coefficient of xr in the expansion of ( 1
+ x ) a/2 is ?

Lovina Kansal · Accepted Answer

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Solve this: Q. If the co - efficient of x4 in the expansion of 1 - x + 2 x 2 12 is n + 2 C r + 1 + r , n + 1 C r + a C r , then the coefficient of xr in the expansion of ( 1 + x ) a/2 is ?

Solve this:

Q. If the co - efficient of x⁴ in the expansion of ${(1 - x + 2 x^{2})}^{12} is^{n + 2} C_{r + 1} + r,^{n + 1} C_{r} +^{a} C_{r}$ , then the coefficient of x^r in the expansion of ( 1 + x ) ^a/2 is ?