Find sigma r=1 to 6 , 5Cr

Dear student

r=16 5Cr=5C1+5C2+5C3+5C4+5C5+5C6=5!1!5-1!+5!2!5-2!+5!3!5-3!+5!4!5-4!+5!5!5-5!+5!6!5-6!    As nCr=n!r!n-r!=5!4!+5!2!×3!+5!3!×2!+5!4!×1!+5!5!+5!6!-1!Please recheck your question as factorial of negative term is not defined.
Regards

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