a) 3/2 − 5/6 + 7/12 − 9/20 + 11/30 − 13/42 + 15/56
b) (1−1/5)(1−2/5)(1−3/5) ... (1−9/5)
c) (1−1/2)(1−1/3)(1−1/4)...(1−1/50)
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