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If the nth term of an AP is given by aₙ = $5 n - 3$ , then the sum of its first 10 terms is:

Competition practiceAlgebra

A270
B220
C490
D245

Step-by-Step Solution

a₁ =

5 (1) - 3 = 2

and a₁₀ =

5 (10) - 3 = 47

. Sum =

n /2

(a₁ + a₁₀) =

10/2 \times (2 + 47) = 5 \times 49 = 245

.

Answer: D) 245

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