defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Sets Operations on Sets

यदि X और Y दो समुच्चय इस प्रकार हैं कि n(X) = 17, n(Y) = 26 और n(X Ս Y) = 37 है, तो n(X Ո Y) ज्ञात करें।

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