The sum of the terms of an infinite geometric progression is 3 and the sum of the squares of the terms is 81 .find the first term of the series ...Please give me full prosses not short hints

Given that the sum of the infinite terms is equal to 3 and sum of squares of the series is 81 we know the formula for infinite series as {a/1-r} a is the first term and r is the common ratio then apply the formula for both the series and solving both we get the first term

Approved