Asked by Ernest Johnson

If the 6 term of an AP is 35 and the 13 term is 27, calculate the 20 term


Answered by mathhelper
a+5d = 35
a+12d = 27
subtract
7d = -8
d = -8/7

sub into a+5d = 35
a - 40/7 = 35
a = 285/7

term20 = a + 19d = .....
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