Question

For a G.P.
i) If t3=20,t6=160, find S7​

Answer 1

Answer:

635

Step-by-step explanation:

T3 = ar power 2

T6 =ar power 5

Now dividing ...

T6/T3

again

T6/T3= 160/20= 8

Now

r=2

Now we have the value of common ratio.....so we can find the value of first term by putting the value of r in T3

a = 5

now we also have first term...

then ,put both in the formula of sum..

Answer 2

Answer:

Step-by-step explanation: