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A teacher wants to take 10 students to a...

A teacher wants to take 10 students to a park. He can take exactly 3 students at a time and will not take the same group of 3 students more than once. Find the number of times (i) each student can go to the park (ii) the teacher can go to the park.

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The correct Answer is:
Hence each student can go to the park `""^(9)C_(2)" times "=(9xx8)/(1xx2)=36` times
The no. of different ways of selecting 3 students out of `10 = ""^(10)C_(3)=120`.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-PERMUTATIONS AND COMBINATIONS-TAXTUAL EXERCISES
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