B. Solve the following problems. Show your solutions.
1. A singer/performer is auditioning for a musical play. If she is required to sing any three of
the 7 prepared songs, in how many ways can she make her choice?
2. If there are 10 people and only 6 chairs are available, in how many ways can they be
seated?
3. Four married couples want to have their pictures taken. In how many ways can they
arrange themselves in a row if (a) couples must stay together? (b) they may stand
anywhere?
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Answer:
number 3 (a) yan sagot sa number 3