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

यदि X और Y दो सम्मुचय इस प्रकार हैं कि n(X) = 23, n(Y) = 39 और n(XUY) = 49 है, तो n(X∩Y) का मान ज्ञात करें।

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