Questions
th term from the end in the expansion of is:
a
25x2
b
-70
c
70
d
-25x2
detailed solution
Correct option is C
As number of terms in the binomial expansion of (x+a)n is (n+1), the rth term from the end is ((n+1)+(−1)(r−1))th=(n+2−r) th term from the beginning.Here n=8, r=5, thus, 5th term from the end is (8+2-5)th5thterm from the beginning, and it is given byt5=8C4x234−3x28−4=8C4=70Talk to our academic expert!
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