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COMBINATIONS

COMBINATIONS. Chose 3 from 4. ABC ABD ACD BCD = 4. Chose 3 from 5. ABC ABD ABE ACD ACE ADE BCD BCE BDE CDE = 10. COMBINATIONS. Chose 2 from 4. AB AC AD BC BD CD = 6. Chose 4 from 5. ABCD ABCE ABDE ACDE BCDE = 5.

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COMBINATIONS

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  1. COMBINATIONS Chose 3 from 4 ABC ABD ACD BCD = 4 Chose 3 from 5 ABC ABD ABE ACD ACE ADE BCD BCE BDE CDE = 10

  2. COMBINATIONS Chose 2 from 4 AB AC AD BC BD CD = 6 Chose 4 from 5 ABCD ABCE ABDE ACDE BCDE = 5

  3. 4P2 = 12 4P3 = 4 5P3 = 20 5P4 = 5 nPr = n! r! = n! r!(n-r)! nCr

  4. nPr = n! r! = n! r!(n-r)! nCr It is SYMMETRICAL

  5. 15C4 = 15C11 15C11 = 15C4 12C4 = 12C8 ‘ 11C5 = 11C6

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