Question

please answer fastly if you know answer then only answer with full process please​

Answer 1

Answer:

to know about GPwe need to know common ratio

Step-by-step explanation:

2.to know sum of n terms=sñ=n/2+2a+n-1×d

Answer 2

in the AP a1=1,a2=1.25,a3=1.5 and the 9th term of the given AP is 3