Find the sum of the sequence 45+46+47+48+.... +124
1 answer:
Answer:

Step-by-step explanation:
The formula for the first n terms of an arithmetic sequence is
Sₙ = n(a₁+ aₙ)/2
1. Find the number of terms
n = (124 - 45) + 1 = 79 + 1 = 80
2. Find the sum
a₁ = 45
a₈₀ = 124

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