If the 2nd, 3rd and 4th terms in the expansion of are 240, 720 and 1080 respectively

MATHEMATICS · Subjective · A Level · Mathematics · Sequences and series · Sequences and series

Problem

If the 2nd, 3rd and 4th terms in the expansion of

(x+y)^n

are 240, 720 and 1080 respectively, find

x, y

and

n