Question 1162381
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The denominator of the probability fraction is the number of ways of choosing 4 of the 18 people: 18C4.<br>
The numerator is the number of ways of choosing 3 of the 15 students AND 1 of the 3 teachers: (15C3) times (3C1).<br>
P(3 students and 1 teacher) = {{{((15C3)*(3C1))/(18C4)}}}<br>
Use a calculator if necessary....<br>
Leave the answer in decimal form only if an approximate answer is needed; leave it as a fraction if an exact answer is required.<br>