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If r > p > q, the number of different selections of p + q things taking r at a time, where p things are identical and q other things are identical, is
  • a)
    p + q - r
  • b)
    q + q - r + 1
  • c)
    r - p - q + 1
  • d)
    non of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
If r > p > q, the number of different selections of p + q things...
 The number of selections of p things from p identical things and r - p things from q identical things = 1 x 1

Similarly in all other cases, 
∴ the total number of ways
= p - (r - q )+ 1 or q - (r - p) + 1
= p + q - r + l
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Most Upvoted Answer
If r > p > q, the number of different selections of p + q things...
 The number of selections of p things from p identical things and r - p things from q identical things = 1 x 1

Similarly in all other cases, 
∴ the total number of ways
= p - (r - q )+ 1 or q - (r - p) + 1
= p + q - r + l
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If r > p > q, the number of different selections of p + q things...
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