In a class, there are 4 boys & 3 girls. In how many ways can a teacher chose a boy representative & a girl representative for the class?
Explanation:
Out of 4 boys 1 representative has to be selected. ∴ Number of ways of selecting 1 boy out of 4 = 4C1 = 4 ways.
Out of 3 girls 1 representative has to be selected. ∴ Number of ways of selecting 1 girl out of 3 = 3C1 = 3 ways.
∴ Total number of ways of selecting 1 boy representative and 1 girl representative for the class = 4 × 3 = 12 ways.
Hence, 12.
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