Find the sum of the arithmetic sequence having the data given a_1=5, d = 7, n = 120

honigtropfenvi

honigtropfenvi

Answered question

2022-09-05

Find the sum of the arithmetic sequence having the data given a 1 = 5 , d = 7, n = 120

Answer & Explanation

Mathias Allen

Mathias Allen

Beginner2022-09-06Added 10 answers

The formula for the sum to n terms of an arithmetic sequence with first terms a and common difference d is given by
S n = n 2 [ 2 a + ( n - 1 ) d ]
S 120 = 102 2 [ ( 2 ) ( 5 ) + ( 120 - 1 ) ( 7 ) ]
= 42993

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