Question

for a gp a=2 r=3 sn=242 find n?​

Answer 1

Answer:

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Answer 2

Answer:

n=5

Step-by-step explanation:

Since r= 3 which is greater than 1 the sum of G.P is Sn= a(r^n-1)/r-1

a=2

r=3

Sn=242

By the formula

242=2(3^n-1)/3-1

=2(3^n-1)/2

=3^n-1

243=3^n

3^5=3^n

Therefore n=5