Aptitude - Odd Man Out and Series - Discussion
Discussion Forum : Odd Man Out and Series - Find Wrong No. (Q.No. 7)
Directions to Solve
Find out the wrong number in the series.
7.
1, 3, 10, 21, 64, 129, 356, 777
Answer: Option
Explanation:
A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.
So, 356 is wrong.
Discussion:
11 comments Page 2 of 2.
Nagendramurthy said:
1 decade ago
Alternate method:
1=1
3=3
10=1+0=1
21=2+1=3
64=6+4=10=1+0=1
129=1+2+9=12=1+2=3
356=3+5+6=14=1+4=5( wrong one.. it should be 1)
777=7+7+7=21=2+1=3
Alternative 1 and 3 series.. this is method is correct..
1=1
3=3
10=1+0=1
21=2+1=3
64=6+4=10=1+0=1
129=1+2+9=12=1+2=3
356=3+5+6=14=1+4=5( wrong one.. it should be 1)
777=7+7+7=21=2+1=3
Alternative 1 and 3 series.. this is method is correct..
(2)
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