In the following number series a wrong number is given. Find out the wrong number.
1, 3, 10, 21, 64, 129, 356, 777
A. 129
B. 21
C. 10
D. 356
Answer: Option D
Solution(By Examveda Team)
The given pattern is,
2nd term → 1*2+1 = 3
3rd term → 3*3+1 = 10
4th term → 10*2+1 = 21
5th term → 21*3+1 = 64
6th term → 64*2+1 = 129
7th term → 129*3+1= 388
So, 7th term 356 is wrong and must be replaced by 388.
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Comments ( 3 )
Related Questions on Number Series Completion
Kuch b chaap doge kya
plz find wrong term in series 2,5,15,131,530,13257
the even terms -->3
21->2+1=3
129->1+2+9=12->1+2=3
777->7+7+7=21->2+1=3
the odd terms-->1
10->1+0=1
64->6+4=10->1+0=1
356->3+5+6=14->1+4=5
the answer is 356 which is different