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तास के 52 पत्तों में से 2 पत्ते पसंद किये जाय तो दोनों पत्ते बेगम अथवा बादशाह का कितनी रीति से पसंद होगा?

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दोनों पत्ते बेगम के 4C2 अथवा दोनों पत्ते बादशाह के 4C2 रीति से चयन होगे ।

∴ कुल प्रकार = 4C2 + 4C2 = \(\frac{4!}{2!(4−2)!}+\frac{4!}{2!(4−2)!}\)

\(\frac{4×3×2!}{2×1×2!}+\frac{4×3×2!}{2×1×2!}\) 6 + 6 = 12

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