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17-08-2017
Mathematics

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find the sum of the first 50 terms. -6,-2,2,6...

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Аноним Аноним

17-08-2017

this is an arithmetic sequence with a1 = -6 and d = 4

Sn = (n/2) (2a1 + (n-1)d)

S50 = (50/2)[2*-6 + (50-1)*4]

= 25 * (-12 + 4*49)

= 4600

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