Question

Find the odd one out of the given sequence:
3, 10, 21, 36, 55, 70, 105

• A. 21
• B. 70
• C. 36
• D. 10

Answer 1

The correct option is B 70

The sequence is $(1\times 3),(2\times 5),(3\times 7),(4\times 9),(5\times 11)$ and so on... So, the number in the 6th position should be $(6\times 13)=78$ but the no. given in the sequence is 70. So, 70 is the odd one out.