SOLUTION: 10 45 120 210....What is next number of this series ?

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Question 771168: 10 45 120 210....What is next number of this series ?
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
Start with 10
Multiply  10 by 9, get   90, divide by 2, get 45.
Multiply  45 by 8, get  360, divide by 3, get 120.
Multiply 120 by 7, get  840, divide by 4, get 210.
Multiply 210 by 6, get 1260, divide by 5, get 252.  <--- answer

Answer: 252

Or you can do it this way with combinations of 10
things taken 1,2,3,4,5 at a time.


 C(10,1) = 10
 C(10,2) = 45
 C(10,3) = 120
 C(10,4) = 210
 C(10,5) = 252  <--answer


Edwin
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