Subject
Quantitative Aptitude
Topic
Permutation & Combination
3 Girls and 4 boys are to be seated in a row on 7 chairs in such a way that all the three girls always sit together. In how many different ways can it be done?
3 Girls and 4 boys are to be seated in a row on 7 chairs in such a way that all the three girls always sit together. In how many different ways can it be done?
ক)
820খ)
720গ)
284ঘ)
496ঙ)
None of theseExplanation
Consider the 3 girls as one unit. Then we have 4 + 1 = 5 people. They can be arranged in 5! = 120 ways. The 3 girls among themselves can be arranged in 3! = 6 ways. The number of required arrangements = 120 × 6 = 720 ways. Hence, the answer is 720,Related questions
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