Finite series

This summation is the same as which series?

• 1 + 2 + 3 + 4 + 5 + 6
• (1 - 2) + (2 - 2) + (3 - 2) + (4 - 2) + (5 - 2) + (6 - 2)
• (1 - 2) + (6 - 2)
• (1 - 2) + (2 - 2) + (3 - 2) + (4 - 2)

Evaluate.

• 20

• 28

• 18

• 21

Find the common ratio: 16, 8, 4, 2, . . .

• r = 2

• r = 8

• r = 1/4

• r= 1/2

Find the sum of the geometric series.

2 + 12 + 72 + 432

• 432

• 518

• 211

• 438

Find the 22nd term of the following sequence:
5, 8, 11, ...

• 14
• 68
• 63
• 71