Question 1168171
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Probability is an area of mathematics where it is useful to know different methods for solving a problem.<br>
Here is an alternative to the (perfectly good) method shown by the other tutor.<br>
(1) Choose 2 of the 7 boys in C(7,2) = 21 ways
(2) Choose 2 of the 5 girls in C(5,2) = 10 ways
(3) Make 2 teams each with one boy and one girl in 2 ways<br>
ANSWER: 21*10*2 = 420 ways.<br>