જો $\binom{10}{2} + \binom{10}{3} + \binom{11}{4} + \binom{12}{5} + \binom{13}{6} = \binom{14}{r}$ હોય,તો $r = \dots$

  • A
    $4$
  • B
    $5$
  • C
    $6$
  • D
    $7$

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$\binom{30}{0}\binom{30}{10} - \binom{30}{1}\binom{30}{11} + \binom{30}{2}\binom{30}{12} - ....... + \binom{30}{20}\binom{30}{30}$ નું મૂલ્ય શું છે?

જો $(1 + x)^n = C_0 + C_1x + C_2x^2 + .......... + C_nx^n$ હોય,તો $\frac{C_1}{C_0} + \frac{2C_2}{C_1} + \frac{3C_3}{C_2} + .... + \frac{nC_n}{C_{n - 1}} = $

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$\sum\limits_{r = 0}^{n - 1} {\frac{{^n{C_r}}}{{^n{C_r} + {\,^n}{C_{r + 1}}}}} $ નું મૂલ્ય શું થાય?

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જો $(1+x)^n$ ના વિસ્તરણમાં $C_0, C_1, C_2, \ldots, C_n$ દ્વિપદી સહગુણકો હોય,તો જ્યારે $n=5$ હોય ત્યારે $\sum_{r=0}^{n} r^3 \cdot C_r$ ની કિંમત શોધો.

જો $n$ એક ધન પૂર્ણાંક હોય,તો $\sum_{r=1}^n r \cdot C_r =$

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