Discussion
There are 35 people in a group. There are 12 school girls, 10 school boys, 5 senior citizens and 8 babies in the group. The organizer of the group wants to select a school girl or a school boy as leader of the group. In how many ways can he do so?
Answer: A
The leader is to be a school girl or a school boy, and no one is both, so the two counts simply add.
\[ 12 + 10 = 22 \]
"Or" between mutually exclusive choices means addition; it would be multiplication only if a girl and a boy were both being chosen.
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