5) In an AP the 9th Term is 2 times the 4th Term and the 12th Term is 78. What is the sum of the first twenty terms? 6) In a GP the 8th term is 384 and the 5th term is 48. Find the sum of the first 10 terms.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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5) In an AP the 9th Term is 2 times the 4th Term and the 12th Term is 78.
What is the sum of the first twenty terms?
6) In a GP the 8th term is 384 and the 5th term is 48. Find the sum of the first 10 terms.
Transcribed Image Text:5) In an AP the 9th Term is 2 times the 4th Term and the 12th Term is 78. What is the sum of the first twenty terms? 6) In a GP the 8th term is 384 and the 5th term is 48. Find the sum of the first 10 terms.
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