If m $$=$$ number of distinct rational numbers pq∈(0$$,$$1) such that p, q ∈ $${1$$, $$2$$, $$3$$, $$4$$, $$5}$$ and n $$=$$ number of mappings from $${1$$, $$2$$, $$3}$$ onto $${1$$, $$2}$$, then m – n is

Correct option is 4None of these

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If m = number of distinct rational numbers $\frac{p}{q} \in (0, 1)$ such that p, q ∈ {1, 2, 3, 4, 5} and n = number of mappings from {1, 2, 3} onto {1, 2}, then m – n is

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Correct option is D

Now, n = 23 – 2 = 6Also, m=4+3+2+1−1=9 as 24=12∴ m – n = 3

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If m = number of distinct rational numbers pq∈(0,1) such that p, q ∈ {1, 2, 3, 4, 5} and n = number of mappings from {1, 2, 3} onto {1, 2}, then m – n is

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If m = number of distinct rational numbers $\frac{p}{q} \in (0, 1)$ such that p, q ∈ {1, 2, 3, 4, 5} and n = number of mappings from {1, 2, 3} onto {1, 2}, then m – n is