6.Permutation and Combination
normal

શબ્દ $'RAJASTHAN' $ ના બધા અક્ષરોનો ઉપયોગ કરીને સ્વરો એક પછી એક આવે તે રીતે કુલ કેટલા શબ્દો મળે?

A

$6! × ^7C_3$

B

$6 × 7!$

C

$5 × 6!$

D

$6 × 6!$

Solution

First we arrange $6$ consonents by $6 !$ then in 7 places

we can arrange $3$ vowels by $\frac{{{\,^7}{{\rm{P}}_3}}}{{3!}}$ or $^7{{\rm{C}}_3}$

Therefore total number of words $\,\, = 6! \times {\,^7}{{\rm{C}}_3}.$

Standard 11
Mathematics

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