Discussion Forum



Given series formed in definite pattern and next number follows the predecessor. 

1)

Find the number in series 4,20,80,240...


A) 480

B) 820

C) 204

D) 320

Answer:

Option A

Explanation:

Term multiply with decreasing factor.
$4\times5=20$
$20\times4=80$ 
$80\times3=240$

So, next product difference is 2 so $240\times2 = 480$