Posted by **oladepo** on Tuesday, August 6, 2013 at 8:52am.

d 9th term of an Ap is 52 while d 12th term is 70. find sum of it's 20th term?

- math -
**Reiny**, Tuesday, August 6, 2013 at 9:22am
Just answered you previous post of the same question.

BTW, "find the sum of it's 20th term" is confusing.

I found the 20th term.

If you want the sum of the first 20 terms, use the values of a and d I found for you and use the formula.

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