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Question

find the probability distribution of number of queens when two cards are drawn i) successively with replacement
ii) simultaneously
iii) without replacement

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Solution

1 Two cards are drawn successively with replacement.PX=0 = PNo queen and no queen =Pno queen × Pno queen = 4852 × 4852 =144169PX=1 = Pqueen and no queen or no queen and queen =Pqueen and no queen + Pno queen and queen = Pqueen × Pno queen + Pno queen × Pqueen =452×4852 + 4852 × 452 =24169PX=2= PQueen and Queen =452×452 =11692 Cards are drawn simultaneously PX=0 = PNo queen and no queen =Pno queen × Pno queen = 4852 × 4751 =564663PX=1 = Pqueen and no queen or no queen and queen =Pqueen and no queen + Pno queen and queen = Pqueen × Pno queen + Pno queen × Pqueen =452×4851 + 4852 × 451 =96663PX=2= PQueen and Queen =452×351 =36633 Without ReplacementPX=0 = PNo queen and no queen =Pno queen × Pno queen = 4852 × 4751 =564663PX=1 = Pqueen and no queen or no queen and queen =Pqueen and no queen + Pno queen and queen = Pqueen × Pno queen + Pno queen × Pqueen =452×4851 + 4852 × 451 =96663PX=2= PQueen and Queen =452×351 =3663

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