Question 18

In the following question, select the odd number from the given alternatives.

Solution

The logic here is

$$\left(14\times15\right)-1=209$$

$$\left(19\times20\right)-1=379$$

$$\left(26\times27\right)-1=701$$

$$\left(29\times30\right)+1=871$$

All the number pairs except 29 - 871 are in the form of N : [N x (N + 1)] - 1.

$$\therefore\ $$29 - 871 is the odd number pair among the given number pairs.

Hence, the correct answer is Option D

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