1. What least number should be added to 1056, so that the sum is completely divisible by 23
4
1
2
3
Answer: Option C
Explanation:
(1056 / 23) gives remainder 21
21 + 2 = 23, So we need to add 2
2. Simplify 586645 * 9999
5865863355
5665863355
4865863355
4665863355
Answer: Option A
Explanation:
Although it is a simple question, but the trick is to save time in solving this.
Rather than multiplying it we can do as follows:
586645 * (10000 - 1) = 5866450000 - 586645 = 5865863355
3. Which of the following is a prime number
9
2
4
8
Answer: Option B
Explanation:
A prime number is a natural number greater than 1 which has no positive divisors other than 1 or itself.
So from above options 2 is that number