Find the sum of the arithmetic series given a1 12, d = 4, and n = 30.
A. 8434
B. 4200
C.4216
D. 2100

D

Step-by-step explanation:

The sum to n terms of an arithmetic series is

= [ 2a₁ + (n - 1)d ]

where a₁ is the first term and d the common difference

Here a₁ = 12, d = 4 and n = 30 , then

= [ (2 × 12) + (29 × 4) ]

     = 15(24 + 116)

     = 15 × 140

     = 2100 → D

step-by-step explanation: noo

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