A person wants to buy one fountain pen, one ball pen and one pencil from a stationery shop.

Question:

A person wants to buy one fountain pen, one ball pen and one pencil from a stationery shop. If there are 10 fountain pen varieties, 12 ball pen varieties and 5 pencil varieties, in how many ways can he select these articles?

Solution:

Number of fountain pen varieties = 10

Number of  ball pen varieties = 12

Number of pencil varieties = 5

Ways to select a fountain pen = 10

Ways to select a ball pen = 12

Ways to select a pencil = 5

Ways to select a fountain pen, a ball pen and a pencil $=10 \times 12 \times 5=600$    (Using the fundamental principle of multiplication)

 

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