In each of the following questions, a number series is given. In each series, only one number is incorrect. Identify the wrong number.
1, 4, 9, 16, 26, 36

Given: 1, 4, 9, 16, 26, 36

Logic: Numbers are increasing perfect square of natural number.

1²= 1

2²= 4

3²= 9

4²= 16

5²= 25 $$\neq$$ 26​

6²= 36

So, wrong number is 26.

Thus, correct option is (d).