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# Set S consists of the integers from -1 to 5, inclusive. If N is the pr

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Re: Set S consists of the integers from -1 to 5, inclusive. If N is the pr [#permalink]
6C3 is understood which gets 20. Did not understand why do we have to add+1?
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Re: Set S consists of the integers from -1 to 5, inclusive. If N is the pr [#permalink]
hershkoch wrote:
6C3 is understood which gets 20. Did not understand why do we have to add+1?

The +1 is simply the value 0 as -1*0*1, 3*2*0,... all equal 0.
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Re: Set S consists of the integers from -1 to 5, inclusive. If N is the pr [#permalink]
So basically, we have 7 different numbers. In those 7 numbers, we need to multiply 3 numbers to get a unique value. If we look carefully, anything multiplied by 0 will be zero.
6C3=20, and we need to add 1 ( anything multiplied by 0).
=20+1=21.

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Re: Set S consists of the integers from -1 to 5, inclusive. If N is the pr [#permalink]
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Re: Set S consists of the integers from -1 to 5, inclusive. If N is the pr [#permalink]
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