Aptitude - Numbers - Discussion

Thanks @Nidhin.

Prime number is nothing but it is divisible by one and itself that type of numbers called prime numbers.

91is not a prime no. Because it is divisible by 13.

Code for prime numbers below 100 is 442233322321.

2,3,5,7 (4)
11,13,17,19 (4)
23,29 (2)
31,37 (2)
41,43,47 (3)
53,59 (2)
61,67 (20
71,73,79 (3)
83,89 (2)
97 (1)

@Karthick.

I have not understood your process please explain me with the other examples.

For 3 numbers calculation:

Let us find whether 149 is prime or not.
[square root of 149= 12.20 < 13] prime numbers below 13 are 2,3,5,7,11.
149 is not exactly divisible by 2, because it don't has even number at the end.
149 is not exactly divisible by 3, because the sum of numbers 1+4+9= 14 is not divisible by 3.
149 is not exactly divisible by 5, because it don't has 0 or 5 at the end.
149 is not exactly divisible by 7,11.
So, 149 is a prime number.

The Prime number means any number is divisible by one and itself.

how to solve this question? Please tell me.

13*7=91 so not prime number.

We can use the elimination method here.

The question says we need a number that is completely divisible by (2^32 + 1). So, a number that satisfies this condition will be larger than the given number.

Option A and B are obviously smaller.

Option C and D are the choices.

On a closer analysis we find that even option c is smaller than the actual number.

So we are left with option D as our final answer. You need to use your wit rather than calculation to solve a problem.