Question

In the following number series, one term does not fit into the series. Find the wrong term.

$3,4,5,7,24,25,9,39,41$

• A. $9$
• B. $39$
• C. $41$
• D. None of these

Answer 1

Answer: (B)

$39$

$3,4,5$ are Pythagorean triples.

$7,24,25$ are Pythagorean triples.
Change $39$ to $40$ and $9,40,41$ are also Pythagorean triples.
(Pythagorean triples are three numbers such that square of the largest number equals to sum of squares of the other two.)

Hence, option B.