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Q:

Find the missing number in the given number series?

5 11 21 44 ? 175

A) 86 B) 78
C) 94 D) 102

Answer:   A) 86



Explanation:

Here the given number series is 5  11  21  44  ?  175

 

Now the given series follows a pattern, that

 

x2 + 1, x2 - 1, x2 + 2, x2 - 2, x2 + 3, x2 - 3,...

 

Then the missing number is x2 - 2

 

= 44 x 2 - 2 = 88 - 2 = 86

 

Hence, the missing number in the number series is 86.

Subject: Odd Man Out
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