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Question

The sum of two positive numbers is 51 and their product is 230. The positive difference between them is:

This question was previously asked in
RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is

41

Let the two numbers be x and y, with \(x + y = 51\) and \(xy = 230\).

Using the identity \((x-y)^2 = (x+y)^2 - 4xy\), we get \((x-y)^2 = 51^2 - 4 \times 230\).

This gives \((x-y)^2 = 2601 - 920 = 1681\).

So \(x - y = \sqrt{1681} = 41\).

Hence, the positive difference between the numbers is 41.

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