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In a class there are 20 boys and 25 girls. In how many ways can a boy and a girl be selected?

Correct answer: B. 500

  • A. 400
  • B. 500
  • C. 600
  • D. 20

Explanation

For each of 20 boys, any one of 25 girls can be selected, so the multiplication principle gives 20 x 25 = 500 boy-girl selections. The likely trap is option a, 400, from multiplying by 20 twice or using an incorrect number of girls.

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