Math, asked by vamikanegi, 8 months ago

if 20Cr = 20Cr-10, then 18Cr=?

Answers

Answered by namanraj38
0

Answer:

18- 9

Step-by-step explanation:

Clearly , we can see this situation form question the first question easily say that the half of 20 is 10 and the 18 half is 9 = 9+9=18

Answered by Krish1735
0

r + r – 10 = 20  (nCx = nCy ⇒ n = x + y or x = y )  2r – 10 = 20  2r = 30  r = 15  Now,  18Cr = 18C15  ∴18C15 = 18C3 ∴ 18C3 =  18 3 × 17 2 × 183×172× 16 = 816.

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