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