Index of (r+1)th Term from End When Counted from Beginning
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Q.
Find the 4th term from the end in the expansion of (x32−2x2)9
Q.
The coefficient of the middle term in the expansion of is
Q.
If the coefficients of 2nd, 3rd and 4th terms in the expansion of (1+x)2n are in AP, show that 2n2−9n+7=0
Q.
If in the expansion of (1+x)n, the coefficient of pth and qth terms are equal and the relation between p and q is p-q =n . Find the value of p2+q2. where p≠q.
Or
Find the term independent of x in the expansion of (2x−1x)10.
Q.
If the coefficients of rth , (r + 1)th , and (r + 2)th terms of (1+x)n are in A.P. then n2–(4r–1)n+4r2=
1
2
2r
3
Q. The 3rd, 4th, 5th terms in the expansion of (x+a)n are respectively 84, 280 and 560. Find the values of x, a and n.