railway RRB Technician Grade 1 Mock Test 2024 Mathematics Sets Operations on Sets

यदि X और Y ऐसे दो समुच्चय हैं कि n(X ∪ Y) = 50, n(X) = 28 और n(Y) = 32 तो n(X - Y) ज्ञात कीजिए।

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