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Combinatorics, Discrete Maths (self doubts)

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Ans – 1 out of 9 digit choose any 4 digit with this there is only one order to arrange in descending order

          so 9C4

Ans-2 This is IODB(Identical objects distinct boxes) templete so (4-1+9)C9 = 12C9 = 220

          u can choose 1111, 1112, 1122, 1123…...

Ans -3 same as previous one think ans is 220
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