Answers

  • Brainly User
2016-06-18T16:21:19+08:00
 S_{n} = \frac{n}{2} (a _{1} + a _{n} )

n = 50
a₁ = 1
a₅₀= 50

S₅₀ = 50/2 (1 + 50)

S₅₀ = 25 (51)

S₅₀ = 1,275
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