Question

how many terms of the series 30, 27, 24 must be taken so that the sum may be 156 solution step by step​

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

a=30

d=-3

we know that

sum=n/2(a+(n-1)d)

  156=n/2(30+(n-1)*-3)

  156=n/2(33-3n)

 312=33n-3n²

n²-11n-104=0

n=(-11+-√(537)/2

 =(-11+23)/2

  =6