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Sets — Maths STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9MathsSets1 Mark
Question
Write the following sets using listing method and classify into finite or infinite set :

F = {(a, b) | a, b ∈ Q, a + b = 11}

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Answer

F = {(a, b ) | a, b Î Q, a +b = 11 }
F = {(6, 5), (3, 8), (3.5,7.5), (-15, 26),. . .} infinitely many such pairs can be written.
so, F is an infinite set.

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