If A is the 5th prime number and B is the 7th prime number, then what is B - A?

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Solution

The correct option is C 6
The first 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29.

The 5th prime number is 11 and the 7th prime number is 17.

So, A = 11 and B = 17.

$\Rightarrow$ B - A = 17 - 11 = 6

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If A is the $5^{t h}$ and B is the $7^{t h}$ prime number from the beginning, find (B - A).

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