Geometric Sum

2,4,6,... is ---- sequence

• Arithmetic

• Geometric

• Both

• None of them

1,2,4,8 .... is ----- sequence

• Arithmetic

• Geometric

• Both

• None of them

1,2,4,8 has first term 1 and common ratio ---

• 1

• 2

• 8

2,6,18,54 has

• a=2

  r=4

• a=3

  r=2

• a=2

  r=3

• a=2

  r=1/3

For the geometric sequence 16,4,1,..., the common ratio is

• • - 12

• -4

• 4

For the geometric sequence 3, -9 , 27, -81,... the common ratio is

• -3

• 3

• -12

• r=-1

• r>1

• r = 1

• r<0

• r<-1

• 728

• -63

• -728

• 189

• 127

• 255

• 256

• 128

For the geometric series, 3,-6, 12, -24, ..., the sum to first 10 terms is ----.

• 513

• -1023

• 512

• -1024