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COMBINATIONS - PowerPoint PPT Presentation


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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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Presentation Transcript
slide1

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

slide2

COMBINATIONS

Chose 2 from 4

AB AC AD BC BD CD = 6

Chose 4 from 5

ABCD ABCE ABDE ACDE BCDE = 5

slide3

4P2 = 12

4P3 = 4

5P3 = 20

5P4 = 5

nPr = n!

r!

= n!

r!(n-r)!

nCr

slide4

nPr = n!

r!

= n!

r!(n-r)!

nCr

It is SYMMETRICAL

slide5

15C4 =

15C11

15C11 =

15C4

12C4 =

12C8

11C5 =

11C6