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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