zionbates zionbates
  • 17-08-2017
  • Mathematics
contestada

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

Respuesta :

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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