Sequences and series

Evaluate the sum of the geometric sequence 1 + 2 + 4 + 8..., n = 6

• 63

• 60

• 46

• 56

• 39

• 40

• 45

• 48

Finite Geometric Series formula:

• 2

• 4

• 5

• 10

Find the sum of the geometric series.

• 732

• -732

• 244

• -244

A geometric series whose first term is 3 and whose common ratio is 4 sums to 4095. The number of terms in this sum is

• 8

• 5

• 6

• 4

• -86

• -87

• -85

Evaluate the geometric series

1-2+4-8..., n=8

• 1/3

• -87

• -86

• -85

The sum of some terms of a G.P is 315 whose first term and the common ratio are 5 and 2, respectively. The number of terms are

• 3

• 4

• 5

• 6

Find the sum of the first 20 terms of geometric progressions 81, 27, 9, 3,...

• 120.5

• 121.5

• -120.5

• -121.5