Sum of the Terms of an Arithmetic Sequence

The sum of n terms of an arithmetic sequence is given by the formula : ________

Fimd the sum of the first eleven terms of the sequence: 28, 34, 40, ... , 88

• 550

• 638

• 610

• 288

Find the sum of the first 10 terms of the arithmetic series:

2 + (-2) + (-6) + (-10) + ...

• -160

• -320

• -328

• -336

Find the sum of last ten terms of the given arithmetic sequence:

8, 10, 12, 14, ... , 126

• 1176

• 1234

• 1123

• 1170

The 5^th term of an arithmetic sequence is -3 and its common difference is - 4.

What is the sum of the first 10 terms of the sequence?

• -50

• -30

• 30

• 50

What is the sum of the first 15 terms of an arithmetic sequence if the 8^th term is 40?

• 320

• 600

• 650

• 900

Answer explanation

Find the sum of all positive numbers less than 100 that are divisible by 9.

• 450

• 495

• 540

• 594

What is the sum of all the odd integers between 8 and 26?

• 153

• 149

• 151

• 148

The sum of the first 11 terms of an arithmetic sequence is 120.

If the sum of the first 12 terms is 132, what is the 12^th term?

• -12

• - 32

• 12

• 32

If the sum of the first 12 terms of an arithmetic series is 312 and a₁₂ = 48, what is the first term?

• 4

• 6

• 48

• 52