Question

Sum of n terms in the AP: -3, -6, -9,....., -27 is:

Answer 1

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a = -3

d = 3

Sₙ = $\frac{n}{2}$ × (a + (n-1)d)

Sₙ = $\frac{n}{2}$× (-3 + (n-1)3)

Sₙ = $\frac{n}{2}$× (-3 + 3n -3)

Sₙ = $\frac{n}{2}$× (3n -6)

Sₙ = $\frac{3n^2x6n}{2}$

This is your answer

Answer 2

Answer:

The given question is correctly solved in the uploaded photo.