UPSC CDS I 2019 Math Paper

Question : 7 of 100

Marks: +1, -0

Which of the following statements is not true 7

[2019 CDS-I]

The difference of two prim e numbers, both greater than 2, is divisible by 2.
For two different integers m, n and a prim e number p, if p divides the product m x n, then p divides either m or n.
If a number is of the form 6n -1 (n being a natural number), then it is a prime number,
There is only one set of three prim e numbers such that there is a gap of 2 between two adjacent prim e numbers.

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