ekrucina93 ekrucina93
  • 24-05-2018
  • Mathematics
contestada

How many terms are in the arithmetic sum 15 + 18 + 21 + … + 99?

n = 1,653


n = 28


n = 27


n = 29

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 24-05-2018
The n-th term is
  a(n) = 15 + 3(n-1)
Then the last term corresponds to the value n that satisfies
  99 = 15 +3(n -1)
  33 = 5 +(n -1)
  29 = n

The appropriate choice is ...
  n = 29
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