Question
Mathematics Question on Algebra
If A and B are coefficients of xn in the expansions of (1+ x)2n and (1+x)2n – 1 respectively, then A/B is equal to
A
(A) 4
B
(B) 2
C
(C) 9
D
(D) 6
Answer
(B) 2
Explanation
Solution
Explanation:
A=2nCnB=2n−1CnAB=2nCn2n−1Cn=2nn=2