Answer: C(10,7)
Reason:
We can numerically compute both C(10, 3) and C(10, 7) and we would get 120 for each result.
Use the nCr combination formula

In general we have the rule C(n, r) = C(n, n-r)
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Answer:

-10416
Step-by-step explanation:
a = 4
r = -5
geometric series: 
Determine which term = -12500:








Using geometric sum series formula: 
Therefore, 
2x^2+(6-1)x-3
2x^2+6x-x-3
2x(x+3)-1(x+3)
(2x-1)(x-1)