Math, asked by jansi161977, 1 year ago

Find the sum to n term of the A.P. 5, 2, -1, -4, -7, ......​

Answers

Answered by jebakiruba
30

I hope that this would help you...

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Answered by AritmoyDatta
37

given ap: 5, 2, -1, -4, -7 ...

a = 5

d = 2 - 5 = -3

nth term: a+(n-1)d

Sn = n/2[2a + (n-1)d]

n/2[2(5) + (n-1)(-3)]

n/2[10 -3n + 3]

13n - 3n^2/2

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AritmoyDatta: i'm very sorry
AritmoyDatta: totally, the instructions were given!
AritmoyDatta: soory for the inconvenience
jansi161977: hey its ok
jansi161977: dont worry
AritmoyDatta: here, i corrected it :)
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