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15 February, 16:42

Simplify 10p4

A. 210

B. 360

C. 5,040

D. 151,200

simplify 9c4

A. 126

B. 15,120

C. 5

D. 3,024

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Answers (1)
  1. 15 February, 17:02
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    10P4 = 10! / (10-4) ! = 10*9*8*7 = 5040

    9C4 = 9! / 5! 4! = 9*8*7*6 / 4*3*2*1 = 126
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