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OpenStudy (anonymous):
evaluate 7C3
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OpenStudy (yanasidlinskiy):
Do you know the formula??
OpenStudy (yanasidlinskiy):
\[\frac{ n! }{ r!(n-r)! }\]
OpenStudy (yanasidlinskiy):
\(\Huge\bf \color{yellow}{Welcome~to~OpenStudy!!}\hspace{-310pt}\color{cyan}{Welcome~to~OpenStudy!!}\hspace{-307.1pt}\color{midnightblue}{Welcome~to~\color{purple}{Open}}\color{blue}{Study!!}\)
OpenStudy (anonymous):
\[C _{3}^{7}=\frac{ 7*6*5 }{ 3*2*1 }=?\]
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