7!/2! = 21 6!/2! = 15 how that ?

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7!/2! = 21 6!/2! = 15 how that ?

Asked by harshpunia109 | 26 Jun, 2023, 07:21: PM

Expert Answer

It must be ⁷C₂ and ⁶C₂

⁷C₂ = 7!/5!2! = 7x6/2 = 7x3 = 21

⁶C₂ = 6!/4!2! = 6x5/2 = 3x5 = 15

Answered by Renu Varma | 27 Jun, 2023, 09:35: AM

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