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Question

In the following number series, a wrong number is given. Find the wrong number.
1, 2, 6, 21, 84, 445, 2676


A
6
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B
21
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C
2676
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D
84
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E
445
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Solution

The correct option is D 84

2676 = 6 × 445 + 6; 445 5 × 84 + 5
84 4 × 21 + 4; 21 = 3 × 6 + 3
6 = 2 × 2 + 2; 2 = 1 × 1 + 1
Obviously, 84 is wrong and should be replaced by 4 × 21+ 4 = 88
With this, 445 = 5 × 88 + 5.


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