Question

The 2nd 3rd and 4th term in the expansion are 240, 720, 1080 find x y and n

Answer 1

2nd = 240 3rd = 720 4th =1080
a+d =240.( 1 ) a+2d=720 ( 2 ) a+3d = 1080 (3) * d = tp-tq/p-q.
= t3 - t2/3 - 2
= 720-240\1
d = 480

* a = a+d=480
= a+480= 480
=. a=480-480
=. a= 0

x :a+d =240.
= 0+480:240
( x = -240 ) (1)

y :a+2d : 720
; 0+2×480;720
: 0+960=720
=960=720
= 720-960
y
= -240