You flip a coin three times and keep a record of the results. In how many ways could you obtain at least one tail?
?

A. 4
B. 11
C. 9
D. 8
E. 7


Answer: E

Mathematics

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A. (x - y)(x + 5y) B. (x - 7y)(x + 5y) C. (x - 7y)(x + y) D. (x + 7y)(x - 5y)

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Find the sum of the first n terms of the sequence.10, -20, 40, . . . ; n = 9

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