Consider an infinite G.P. with first term a and common ratio r, its sum is 4 and the second term is 3/4, then
a = 7/4, r = 3/7
a = 2, r = 3/8
a = 3, r = 1/4
a = 3/2, r = ½
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2
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What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?
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3
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For an A.P. if a25 - a20 = 45, then d equals to:
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4
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5
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6
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7
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8
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9
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10
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