Last Activity: 13 Years ago
AM(arithemetic mean) = a+b/2
here in this question a = 5 & b = 20 so
AM = 20+5/2 = 25/2
now series is 5 , 25/2 , 20
common difference = 15/2 & first term is 5
approve if u like my ans
assume the arithmetic mean to be A
so the sequence now is
5 , A , 20
A = (a+b)/2 where a = 5 , b = 20
so A = ( 20+5 )/2
A = 25/2
Please approve
Prepraring for the competition made easy just by live online class.
Full Live Access
Study Material
Live Doubts Solving
Daily Class Assignments
Get your questions answered by the expert for free
Last Activity: 2 Year ago(s)