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Q.

The equation 2x + 5y = 7 has a unique solution, if x, y are:

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a

Real numbers

b

Positive real numbers

c

Natural numbers

d

Rational numbers

answer is C.

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Detailed Solution

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The equation 2x + 5y = 7 has a unique solution, if x, y are natural numbers.

In natural numbers, there exists only one pair (1, 1) which satisfies the given equation. But for rational numbers, real numbers, positive real numbers, there exist many solution pairs to satisfy the equation.

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