Permutation & Combination

Front

What is a permutation?

Back

A permutation is an arrangement of objects in a specific order. The order of arrangement matters.

Front

What is a combination?

Back

A combination is a selection of objects where the order does not matter.

Front

How many ways can 3 people be seated on 8 seats in a row?

Back

336 ways.

Front

How do you calculate permutations of n objects taken r at a time?

Back

The formula is P(n, r) = n! / (n - r)!.

Front

How do you calculate combinations of n objects taken r at a time?

Back

The formula is C(n, r) = n! / [r!(n - r)!].

Front

In how many ways can 3 prefects be chosen out of 8 prefects?

Back

56 ways.

Front

If there are 10 candidates running for 3 positions, how many ways can the positions be filled?

Back

720 ways.

Front

What is the difference between permutations and combinations?

Back

Permutations consider the order of selection, while combinations do not.

Front

How many different ways can a team be formed with 3 engineers from 8 and 4 designers from 6?

Back

840 ways.

Front

In how many ways can three letters be selected from the word 'PARENTS'?

Back

35 ways.