4 A man kept 6 black, 5 brown and 7 purple shirts in a drawer. What is the probability of his picking a black shirt with his eyes closed ?
711
711
718
718
511
511
13
13
5 In how many ways can the word "HOSPITAL" be arranged?
45040
120
924
40320
6 In how many ways can the word "TOPOLOGY" be arranged
720 ways
56 ways
84 ways
21 ways
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