a. 1/3

b.1/8

c. 1/13

d. 1/18

(with solution)

Use the formula:

an=a1+(n-1)d

18=-2+(5-1)d

18=-2+4d

Combine the similar terms:

18+2=4d

20=4d

Divide both sides by 4:

d=5

To find the second mean:

a2=a1+d

a2=-2+5

a2=3

Since harmonic sequence is a sequence in such reciprocals will form an arithmetic sequence:

The Second mean is

A.1/3

an=a1+(n-1)d

18=-2+(5-1)d

18=-2+4d

Combine the similar terms:

18+2=4d

20=4d

Divide both sides by 4:

d=5

To find the second mean:

a2=a1+d

a2=-2+5

a2=3

Since harmonic sequence is a sequence in such reciprocals will form an arithmetic sequence:

The Second mean is

A.1/3

D. Geometric Mean

Step-by-step explanation:

12 x 2 = 24

24 x 2 = 48 and so on

I can't explain Pero geometric Po yang sequence yan

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