Question

3. How many terms are there in the G. P.5, 20,80, .......,5,120​

Answer 1

Answer:

6

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Step-by-step explanation:

a=5

r=4

an=5(4)^n-1

5120/5=(4)^n-1

1024=(4)^n-1

(4)^5=(4)^n-1

so

n-1=5

n=6