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7.Binomial Theorem
normal
જો $r,k,p \in W,$ હોય તો $\sum\limits_{r + k + p = 10} {{}^{30}{C_r} \cdot {}^{20}{C_k} \cdot {}^{10}{C_p}} $ ની કિમત મેળવો
A
$\left( {\begin{array}{*{20}{c}} {60} \\ {50} \end{array}} \right)$
B
$\left( {\begin{array}{*{20}{c}} {60} \\ {30} \end{array}} \right)$
C
$\left( {\begin{array}{*{20}{c}} {60} \\ {20} \end{array}} \right)$
D
$\left( {\begin{array}{*{20}{c}} {30} \\ {10} \end{array}} \right)\left( {\begin{array}{*{20}{c}} {30} \\ {20} \end{array}} \right)$
Solution
requind sum is coefficientof $x^{10}$ in the expansion of $(1+x)^{30}(1+x)^{20}(1+x)^{10}$ i.e. ${\,^{60}}{C_{10}}$
Standard 11
Mathematics