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Find the number of ways in which one or...

Find the number of ways in which one or more letters can be selected from the letters PPPQQQQRRRRRSTUV.

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`3p^s` are alike, 4Q.s are alike, 5r.s are alike and S, T, U, V 4 letters are different. `therefore` Total number of combinations=` (3+1)(4+1)(5+1)xx2^4-1 = 4.5.6.16-1= 1919.`
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PATHFINDER-PERMUTATION AND COMBINATIONS-QUESTION BANK
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