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Question

Identify the wrong number in the series :
69, 55, 26, 13, 5


A
5
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B
13
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C
26
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D
55
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Solution

The correct option is A 5
Clearly, the given series, each term is one more than the product of the digits of the preceding term. Thus, $$(6\times 9)+1=55$$, $$(5\times 5)+1=26$$, $$(2\times 6)+1=13$$.
So, 5 is wrong and must be replaced by $$(1\times 3)+1$$ i.e. 4.
Hence, the answer is (A).

Logical Reasoning

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