the difference between consecutive terms is ... -k/3
(a) 0 - k/3 - k/3 = -2k/3
(b) k - [(n-1)k/3]
(c) from (b) ... 15 = k - [(20 - 1) * k/3] ... solve for k
An AP is given by k, 2k/3, k/3, 0,....
(a) Find the sixth term.
(b) Find the n th term.
(c) If the 20th term is equal to 15, find k.
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