# Algebra

How many ways can Hannah give 3 of her 8 T-shirts to her younger sister?

Do you multiply 8*3?

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1. use the 8C3.now, can u evaluate the value of 8C3 ?.nCr = n!/r!(n-r)!it is the general formula of combination. also u have know about the "factorial", like
3! = 3 * 2 * 1 = 6
8C3, in this case knowed n=8 and r=3. by using the formula above, it can be
8C3 = 8!/3!(8-3)! = 8!/3!5! = 8 * 7 * 6 * 5! / 3*2*1*5! (cancel out the 5!)
= 8 * 7 * 6 / 3 * 2 * 1 = 8*7*6/6 (cancel out the 6) = 8 * 7 = 56

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posted by Elena
2. there are 56 ways

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posted by Elena

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