Given:
10 fountain pens, 12 ball pens, and 5 pencil
Here the person has to
(i) Select a ball pen from 12 ball pens.
(ii) Select a fountain pen from 10 fountain pens, and
(iii) Select a pencil from 5 pencils.
The number of ways to select one fountain pen is 10C1 and similarly the number of ways to select one ball pen is 12C1 and number of ways to select one pencil from 5 pencils is 5C1
Hence, the number of ways to select one fountain pen, one ball pen and one pencil from a stationery shop is 10C1 × 12C1 × 5C1 = 10 × 12 × 5 = 600 ways.
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