Question

Which expression represents the value of the series below?

3+7+11+ 15 + ... +1,671
418
Ο Σ [3+{n-1)4]
h=1
417
Ο Σ [3+(n+1)4]
n=1
416
Ο Σ [3+(n-1)4]
h=1
417
Ο Σ[3+(n-1)4]
h=1

Answer 1

349866

Explanation:

L = a + (n - 1) * d

1671 = 3 + (n - 1) * 4

1668 = (n - 1) * 4

417 = n - 1

n = 418

Sn = n/2 * (a + L)

Sn = 418/2 * (3 + 1671)

Sn = 349866