1, 9, 25, ?, 361, 841, 1681 - What will come in the place of question mark?

1, 9, 25, ?, 361, 841, 1681(This is not correct series.)

 

Correct Series is:

 

1, 25, ?, 361, 841, 1681

 

Options:

 

(a) 169

 

(b) 225

 

(c) 161

 

(d) 121

 

Best Answer-

 

(1)^2=1

 

(5)^2=25

 

(11)^2=121

 

(19)^2=361

 

(29)^2=841

 

(41)^2=1681

 

Now,

 

5-1=4

 

11-5=6

 

19-11=8

 

29-19=10

 

41-29=12

 

Consecutive Even Number Series:

 

4, 6, 8, 10, 12

 

Therefore, 121 is the correct answer.