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  4. The value of 15 C8+ 15 C9- 15 C6- 15 C7=

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Q. The value of ${ }^{15} C_{8}+{ }^{15} C_{9}-{ }^{15} C_{6}-{ }^{15} C_{7}=$

Solution:

${ }^{16} c_{9}-\left({ }^{16} c_{7}\right)=0$
$\left({ }^{n} c_{r}+{ }^{n} c_{r-1}={ }^{n+1} c_{r}\right)$