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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jansi161977: your welcome

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

AritmoyDatta: :O

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 :)

jansi161977: thanks

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