Find the sum of the following arithmetic series: 17+21+25

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Find the sum of the following arithmetic series: 17+21+25

Jun 17th, 2015

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S = (n/2) × (2a + (n-1)d)

S = (3/2) × (2(17) + (3-1)4)

S = (3/2) × (2(17) + 8)

S=(3/2) (42)

s= 62

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Jun 17th, 2015

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