Sure short brownie in Quants
Find the wrong term in the following number series:
Moderate to hard level
1) 3, 5, 10, 27, 90, 349, 1374
90
3
10
5
349
Solution
Here, the sequence is going like this:
So, 90 is the wrong term in the given series.
2)7, 28, 63, 124, 215, 342, 511
28
63
124
215
342
Solution
23 - 1 = 7
33 - 1 = 26 (Not 28)
43 - 1 = 63
53 - 1 = 124
63 - 1 = 215
73 - 1 = 342
83 - 1 = 511
Hence, 28 is a wrong number. The correct number is 26.
3)1, 3, 10, 36, 152, 760, 4632
36
152
10
760
4632
Solution
From above,
760 is wrong in the given series. 770 should come in place of 760.
Therefore, option 4 is the correct answer.
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