Find the ninth term of the sequence square root of 5, square root of 10, 2 square root of 5,

a. sqrt 20
b. 16 sqrt 5
c. 20 sqrt 5
d. 48 sqrt 5

(the answer is not c)

B

Step-by-step explanation:

This is a geometric sequence with common ratio r and n th term

= a

where a is the first term

r = =

r = = =

The first term a =

= ×

[ Note × = 2 ], hence

= 2 × 2 × 2 × 2 = 16

⇒ = 16 → B

19

step-by-step explanation:

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