Respuesta :

mhanifa

Answer:

  • B. 21/2

Step-by-step explanation:

According to sigma notation we have a GP with:

  • The first term of 8
  • The common ratio of 1/4

Find the sum of the first 3 terms:

  • Sₙ = a₁(1 - rⁿ) / (1 - r)
  • S₃ = 8*(1 - 1/4³) / (1 - 1/4) = 8*(1 - 1/64) / (3/4) = 8*63/64 * 4/3 = 21 / 2

Correct choice is B