shiladitya

1. Kate prepared 4 different letters to be sent to 4 different addresses. For each letter, she prepared an envelope with its correct address. if the 4 letters are to be put into the 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address? A. 1/24 B. 1/8 C. 1/4 D. 1/3 E. 3/8 Ans. D 2. Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and then put back into the bowl; then a second card is drawn. If the cards are drawn at random and if the sum of the numbers on the cards is 8, what is the probability that one of the two cards drawn is numbered 5? A. 1/6 B. 1/5 C. 1/3 D. 2/5 E. 2/3 Ans D

From a group of 8 volunteers, including Andrew and Karen, 4 people are to be selected at random to organize a charity event. What is the probability that Andrew will be among the 4 volunteers selected and Karen will not? a) 3/7 b) 5/12 c) 27/70 d)2/7 e) 9/35 Answer : c) 2/7