Question

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

• A. 5
• B. 13
• C. 26
• D. 55

Answer 1

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).