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In a class there are 20 boys and 10 girls. The teacher wants to

select either a boy or a girl to represent the class in a function. In how many
ways can the teacher make this selection?


It can be done in 30 ways
1 5 1
By 30 ways because the total strength is 30
0 0 0
since there is either boy OR a girl fundamental principle for OR is + so it is 10+20=30
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