Question

In a geometry progression the first term is -3and the common ratio is 3. Found the sum of the first 7terms?​

Answer 1

Answer:

ANSWER

a=3,a

r−1

=3072

and s

n

=

1−r

a(1−r

n

)

4095=

1−r

a+ar

n−1

r

⇒4095=

1−r

3−3072r

⇒4095=

1−r

3(1−1024r)

⇒1365=

1−r

1−1024r

⇒1365(1−r)=1−1024r

⇒1365−1365r=1−1024r

⇒341r=1364

⇒r=4

Then common ratio of GP is 4

Step-by-step explanation:

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