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<img class=Wirisformula style=vertical-align: -9px; src=/application/zrc/images/qvar/MAEN11033716-1.png alt=fraction numerator 1 over denominator 6 factorial end fraction plus fraction numerator 1 over denominator 7 factorial end fraction space equals space fraction numerator 1 over denominator 6 factorial end fraction plus fraction numerator 1 over denominator 7 cross times 6 factorial end fraction equals fraction numerator 7 plus 1 over denominator 7 cross times 6 factorial end fraction equals fraction numerator 8 over denominator 7 cross times 6 factorial end fraction equals fraction numerator 8 over denominator 7 factorial end fraction equals fraction numerator 8 over denominator 7 cross times 6 cross times 5 cross times 4 cross times 3 cross times 2 cross times 1 end fraction equals 1 over 630 width=493 height=25 align=middle data-mathml=«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mfrac»«mn»1«/mn»«mrow»«mn»6«/mn»«mo»!«/mo»«/mrow»«/mfrac»«mo»+«/mo»«mfrac»«mn»1«/mn»«mrow»«mn»7«/mn»«mo»!«/mo»«/mrow»«/mfrac»«mo»§#160;«/mo»«mo»=«/mo»«mo»§#160;«/mo»«mfrac»«mn»1«/mn»«mrow»«mn»6«/mn»«mo»!«/mo»«/mrow»«/mfrac»«mo»+«/mo»«mfrac»«mn»1«/mn»«mrow»«mn»7«/mn»«mo»§#215;«/mo»«mn»6«/mn»«mo»!«/mo»«/mrow»«/mfrac»«mo»=«/mo»«mfrac»«mrow»«mn»7«/mn»«mo»+«/mo»«mn»1«/mn»«/mrow»«mrow»«mn»7«/mn»«mo»§#215;«/mo»«mn»6«/mn»«mo»!«/mo»«/mrow»«/mfrac»«mo»=«/mo»«mfrac»«mn»8«/mn»«mrow»«mn»7«/mn»«mo»§#215;«/mo»«mn»6«/mn»«mo»!«/mo»«/mrow»«/mfrac»«mo»=«/mo»«mfrac»«mn»8«/mn»«mrow»«mn»7«/mn»«mo»!«/mo»«/mrow»«/mfrac»«mo»=«/mo»«mfrac»«mn»8«/mn»«mrow»«mn»7«/mn»«mo»§#215;«/mo»«mn»6«/mn»«mo»§#215;«/mo»«mn»5«/mn»«mo»§#215;«/mo»«mn»4«/mn»«mo»§#215;«/mo»«mn»3«/mn»«mo»§#215;«/mo»«mn»2«/mn»«mo»§#215;«/mo»«mn»1«/mn»«/mrow»«/mfrac»«mo»=«/mo»«mfrac»«mn»1«/mn»«mn»630«/mn»«/mfrac»«/math»> - Wired Faculty

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Permutations And Combinations

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$fraction numerator 1 over denominator 6 factorial end fraction plus fraction numerator 1 over denominator 7 factorial end fraction space$

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