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JEE MATHEMATICS MCQ: COMBINATIONS

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Application +4 | -1

If

r > p > q,

the number of different selections of

p + q

thing taking r at a time, where p things are identical and

q

other things are identical, is

View answer and explanation

Correct option: B

p + q - r + 1

Option B (

p + q - r + 1

) is correct because it represents the number of ways to select the items given the constraints.

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n