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Click the option on the left followed by your answer on the right
Scorecard
Correct
Incorrect
1
Arranging n items
$$n!$$
2
Selecting and arranging 'r' objects from a set of 'n' distinct objects
$$^nP_r$$ or $$\frac{n!}{(n-r)!}$$
3
Selecting 'r' objects from a set of 'n' distinct objects
$$^nC_r$$ or $$\frac{n!}{(n-r)!r!}$$
4
Total selection that can be made from 'n' distinct object
$$ 2^n$$
5
Arranging 'n' distinct items around a circle/table
$$(n-1)!$$
6
Arranging 'n' distinct items around a necklace
$$\dfrac{(n-1)!}{2}$$
Educational materials for CAT preparation
