Question

When all the prime numbers less than $100$ are multiplied, the digit at ones place is

• A. $3$
• B. $2$
• C. $1$
• D. $0$

Answer 1

The correct option is D

$0$

Prime number:

Prime numbers are natural numbers that are divisible by one and itself.

Example:$2,3,5,7,11,13,17,19$ (etc).

Explanation for correct option:

Option-$\mathrm{D}:0$

Look at the first $3$ prime numbers

$2\times 3\times 5=30$

Any number multiplied by $30$ will get the unit's place $0$.

Therefore, If once you have a number ending with $0$, all of the rest will end in $0$.

Hence,Option-$\mathrm{D}:0$ is the correct answer.