Verbal Reasoning - Mental Ability Questions

Second, fourth and the sixth digits of the number are 3, 1 and 6. Using these digits only once we can make 361, which is a perfect square number. Hence, our answer is 19 x 19 = 361

Unit digit of this expression is always 1 as the base ends with 1. 

For the tenth place digit we need to multiply the digit in the tenth place of the base and unit digit of the power and take its unit digit.

i.e, tenth place digit in 2151 is 5 and

tenth place digit in power 415 is 1

And the units digit in the product of 5 x 1 = 5

Therefore, last two digits of 2151415 is 51.

Letters in the word                     Letters in the alphabet

$$\begin{gathered} PRES \\ - - \end{gathered}$$

                                $$\begin{gathered} PQRS \\ - - \end{gathered}$$

$$\begin{gathered} RESEN \\ - - \end{gathered}$$                             $$\begin{gathered} RQPON \\ - - \end{gathered}$$

Enormous means very large in quantity or size or extent.

Antonym or opposite of enormous is little, small or tiny.

Here Lizard is a type of Reptiles whereas Orchid is a type of flowers. Other than Orchids all are parts of Plants.

Hence, Reptile is to Lizard as Flower is to Orchids.

The letters move 1, 2, 3, ... steps forward.
The numbers increase by + 3, + 5, + 7, + 9....