matugukwami matugukwami
  • 13-03-2022
  • Mathematics
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Q2. The sum of the 3rd term to the 7th in a geometric series is 3267. Find the first term if the common ratio is 3. (3 marks)​

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salmamomin02
salmamomin02 salmamomin02
  • 13-03-2022

Answer:

142884, Answer,

Step-by-step explanation:

The first term of a GP is 7, the ratio is 3. What is the sum of the 7th and 10th term?

Solution: In the given GP, a = 7 and r = 3.

The sum of the 7th and the tenth terms

= T7 +T10 = ar^6 + ar^9 = ar^6[1+r^3]

= 7*3^6[1+3^3]

= 5103*28

= 142884, Answer,

please mark brainliest

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