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Posted by **oladepo** on Tuesday, August 6, 2013 at 8:19am.

- arithmetic progression -
**Reiny**, Tuesday, August 6, 2013 at 9:19am9th term = 52 ---> a + 8d = 52

12th term = 70 --> a + 11d = 70

subtract them

3d = 18

d = 6

then a+48 = 52

a = 4

20th term = a + 19d = 4 + 114 = 118

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