Answers

2016-04-08T18:07:06+05:30
This series is Arithmetic Progression (AP).
For this AP,

First Term, a = 5
Common Difference, d = 8-5 = 3
No. of terms, n = 60
Sum of first n terms, Sn

Sn = n/2 (2a + (n-1)d )
∴S₆₀ = 60/2 (2(5) + (60 - 1)*3)
         = 30 (10 + 59 * 3)
         = 30 (10 + 177)
         = 30 * 187
S₆₀ = 5610

Thus, sum of first 60 terms of the A.P. is 5610.
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Please mark as brainliest answer.
2016-04-08T18:13:17+05:30
A = 5 d = 8-5 = 3 n = 60 Sn = n/2 (2a + (n-1)d ) ∴S₆₀ = 60/2 (2(5) + (60 - 1)*3) = 30 (10 + 59 * 3) = 30 (10 + 177) = 30× 187 ∴S₆₀ = 5610 PLZ MARK AS A BRAINLIEST. I NEEDED PLZ MARK AS A BRAINLIEST.
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