Download Presentation

COMBINATIONS

97 Views

Download Presentation
## COMBINATIONS

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -

**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**4P2 = 12**4P3 = 4 5P3 = 20 5P4 = 5 nPr = n! r! = n! r!(n-r)! nCr**nPr = n!**r! = n! r!(n-r)! nCr It is SYMMETRICAL**15C4 =**15C11 15C11 = 15C4 12C4 = 12C8 ‘ 11C5 = 11C6