Find the 20th term from the last term of the AP 3, 8, 13,..., 253.
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a = 3
d = 5
n = 20
an = a + ( n-1)d
a20 = 3 + (20-1)5
a20 = 3 + 19 × 4
a20 = 3 + 76
a20 = 79
79 is the 20th term of the given A.P
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