Quantitative Aptitude Ques 2213

Question: Directions: In these questions, a number series is given. Only one number is wrong which does not fit in the series. Find out the wrong number. [RBI (Assistant) Grade B 2015]

10, 4, 3, 3.5, 6, 15, 41

Options:

A) 3

B) 15

C) 4

D) 6

E) 3.5

Show Answer

Answer:

Correct Answer: B

Solution:

  • $ 10\times 0.5-1=4 $
    $ \Rightarrow $ $ 4\times 1-1=3 $ $ 3\times 1.5-1=3.5 $
    $ \Rightarrow $ $ 3.5\times 2-1=6 $ $ 6\times 2.5-1=[14] $
    $ \Rightarrow $ $ 14\times 3-1=41 $

$ \therefore $ Wrong number $ =15 $

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