Question 1132613
<br>
P(at least one gets the first question correct) = 1 - P(none get it correct)<br>
P(1 wrong) = 75% = 3/4
P(2 wrong) = 50% = 1/2
P(3 wrong) = 40% = 2/5
P(4 wrong) = 20% = 1/5<br>
P(none get it correct) = (3/4)(1/2)(2/5)(1/5) = 6/200 = 3/100<br>
P(at least one gets it correct = 1-3/100 = 97/100<br>
ANSWER A