Quantitative Aptitude Ques 1224

Question: Directions: In each of these questions, a number series is given. In each series, only one number is wrong. Find out the wrong number. [SBI (PO) 2011]

4, 12, 42, 196, 1005, 6066, 42511

Options:

A) 12

B) 42

C) 1005

D) 196

E) 6066

Show Answer

Answer:

Correct Answer: B

Solution:

  • $ 4\times 2+{{(2)}^{2}}=12 $
    $ \Rightarrow $ $ 12\times 3+{{(3)}^{2}}=45\ne 42 $ $ 45\times 4{{(4)}^{2}}=196 $
    $ \Rightarrow $ $ 196\times 5+{{(5)}^{2}}=1005 $ $ 1005\times 6+{{(6)}^{2}}=6066 $ $ 6066\times 7+{{(7)}^{2}}=42511 $
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