note that a13-a6 = 7d = 77-35 = 42
a20 = a13 + 7d = 77 + 42
the sixth term of an AP is 35 and 13th term is 77.find the 20th term.
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The 6th term of an A.P is 35 and the 13th term is 77. Find the 20th term.
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