Subject :IMO Class : Class 4
Which number will replace the question mark in the given series?
9, 11, 20, 31, ? , 82
(A) 41
(B) 51
(C) 71
(D) 60
OMG it's impossible!!
Ans 1:
Class : Class 8
Ans:B 51
As 9+11=20, 11+20=31, 20+31=51, 31+51=82
Ans 2:
Class : Class 4
51