7.Binomial Theorem
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$\sum\limits_{r = 0}^{15} {\left( {{}^{15}{C_r}{}^{40}{C_{15}}{}^{20}{C_r} - {}^{35}{C_{15}}{}^{15}{C_r}{}^{25}{C_r}} \right)} $ ની કિમત મેળવો 

A

$0$

B

${{}^{40}{C_{15}} - {}^{35}{C_{15}}}$

C

${{}^{35}{C_{15}} - {}^{40}{C_{15}}}$

D

$^{40}C_{15}$

Solution

$^{40}{C_{15}}\sum\limits_{r = 0}^{15} {{\,^{15}}{C_r}} {\,^{20}}{C_{20 – r}} – {\,^{35}}{C_{15}}\sum\limits_{r = 0}^{15} {{\,^{15}}{C_r}} {\,^{25}}{C_{25 – r}}$

$^{40}{C_{15}}{\,^{35}}{C_{20}} – {\,^{35}}{C_{15}}{\,^{40}}{C_{25}} = 0$

Standard 11
Mathematics

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