1. In a class, there are 27 boys and 14 girls. A teacher wants to select one boy and one girl to represent the class in a meeting. In how many ways can the selection be made?
A. 506 B. 118 C. 378 D. 209
2. Everyone in a room shakes hands with everyone else. The total number of handshakes is 78. How many persons are in the room?
A. 15 B. 13 C. 14 D. 12
A. 506 B. 118 C. 378 D. 209
2. Everyone in a room shakes hands with everyone else. The total number of handshakes is 78. How many persons are in the room?
A. 15 B. 13 C. 14 D. 12
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Answer:
1. C.
2. D.
Step-by-step explanation:
1. Multiply 27×14 to count the possible pairs
2. The amount of of consecutive numbers from 1 that has the sum of 78 is the number of people