Answers

  • Brainly User
2016-06-25T22:27:01+08:00
The first 25 terms of the series of multiples of 8:

8, 16, 24, ...

Since the 25th term is not stated, we use:

 S_{n} = n/2 [2(a₁ + (n-1) (d)]

n = 25     a₁ = 8    d = 8  (difference between two consecutive terms)

Substitute:

S₂₅ = 25/2 [2(8) + (25-1) (8)]

S₂₅ = 25/2 [16 + (24)(8)]

S₂₅ = 25/2 [ 16 + 192]

S₂₅ = 25/2 (208)

S₂₅ = 25 (104)

S₂₅ = 2,600

ANSWER:  2,600
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