Find A1 when in an arithmetic series S7=56, and d=5

Messiah Sutton

Messiah Sutton

Answered question

2022-11-18

Find A1 when in an arithmetic series S7=56, and d=5

Answer & Explanation

oraloorjz0

oraloorjz0

Beginner2022-11-19Added 7 answers

We know that in an AP, n t h term is given by
a n = a 1 + ( n 1 ) d
where a 1 is the first term and d is common difference.

Given a 7 = 56 and d = 5 , substituting in the general expression and solving for a1
56 = a 1 + ( 7 1 ) 5
a 1 = 26

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