Math, asked by andleeb8064, 1 year ago

The common ratio of a finite geometric series is 3 and its last term is 486. If the sum of these n terms be 728, the first term of the series is

Answers

Answered by anuradhasunshine

0

Answer: 2

Step-by-step explanation: r = 3 l= 486 Sn= 728

We know that

Sn = lr- a /r -1

728 = 486 * 3 - a / 3 - 1

1456 = 1458 - a

A = 2

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