SOLUTION: (2x + 1C3) - (2x-1C3) - 2(xC2) NOTE: C stands for combination

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Question 1134470: (2x + 1C3) - (2x-1C3) - 2(xC2)
NOTE: C stands for combination
Found 2 solutions by MathLover1, MathTherapy:
Answer by MathLover1(20849)   (Show Source): You can put this solution on YOUR website!


NOTE: C stands for combination
Remember, the formula to calculate combinations is , where represents the number of items, and represents the number of items being chosen at a time.
=> means and

since it can be chosen at a time from zero times
=> means and


then





Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

(2x + 1C3) - (2x-1C3) - 2(xC2)
NOTE: C stands for combination
If this is: , and with , we get:



















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