Answer :

Let us consider that 2/√7 is a rational number.

Let 2/√7 = a/b for b ≠ 0 ……………… (i)

Where a and b are co-prime integer numbers.

From (i) we can write as follows:

2b/a = √7

Now from the LHS we know that a and b are integral numbers and therefore the fraction will also be rational number which implies that √7 has to be a rational number. But we know that √7 is an irrational number.

So our assumption at the beginning of the problem is proved false.

So 2/√7 is an irrational number.

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