Question

Which term of the AP: 13,- 17,- 47,- 77, ....is - 557?
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Answer 1

Answer:

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Answer 2

Answer:

An = a+(n-1)d

-557=13+(n-1)(-30)

(-557-13)/ (-30) = n-1

-570/(-30) = n-1

19 = n-1

n = 20.

so,,,, -557 is 20th term..