Math, asked by Abisha14, 1 year ago

15Cr:15Cr-1=11:5 find r

Answers

Answered by Garg2723

6

=15Cr / 11 = 15Cr-1 / 5
=15Cr / 15Cr-1 = 11/5
=15-r + 1 / r = 11/5
(nCr / nCr-1 = n- r+1/ r )
=80 = 11r + 5r
= r= 5

Abisha14: Thank you

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