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Solution :

Here the teacher is to perform two operations: <br> (i) selecting 1 boy out of 15 boys, <br> and (ii) selecting 1 girl out of 12 girls. <br> The first of these can be done in 15 ways and the second in 12 ways. <br> So, by the fundamental principle of multiplication, the required number of ways `=(15xx12)=180.` <br> Hence, the teacher can make the selection of 1 boy and 1 girl in 180 ways.