Question -
Answer -
Given:
10 fountain pens, 12ball pens, and 5 pencil
Here the person has to
(i) Select a ball penfrom 12 ball pens.
(ii) Select a fountainpen from 10 fountain pens, and
(iii) Select a pencilfrom 5 pencils.
The number of ways toselect one fountain pen is 10C1 and similarlythe number of ways to select one ball pen is 12C1 andnumber of ways to select one pencil from 5 pencils is 5C1
Hence, the number ofways to select one fountain pen, one ball pen and one pencil from a stationeryshop is 10C1 × 12C1 × 5C1= 10 × 12 × 5 = 600 ways.