Find out the wrong number. 1, 2, 6, 21, 84, 445, 2676

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RRB TC CC Exam (Chandigarh) 2008 click here to view all questions

In each of the following questions, one number is wrong in the series. Find out the wrong number.
1, 2, 6, 21, 84, 445, 2676

A2

B6

C21

D84

Nithin K ? Mar 13 '2018 at 20:57

Answer is : 84

Explanation:

Pattern of the Given series is

\(1 \times 1 +1 = 2\)
\(2\times2 +2 = 6\)
\(6\times3 +3 = 21 \)
\(21 \times4 +4 = 88\)
\(88 \times5 +5 = 445\)
\(445 \times6 + 6= 2676\)

Therefore, 84 should be replaced by 88.

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Answer is : 84 Explanation: Pattern of the Given series is \(1 \times 1 +1 = 2\) \(2\times2 +2 = 6\) \(6\times3 +3 = 21 \) \(21 \times4 +4 = 88\) \(88 \times5 +5 = 445\) \(445 \times6 + 6= 2676\) Therefore, 84 should be replaced by 88. Nithin K ? answered Mar 13 '2018 at 20:57 All Comments

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