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प्रश्न
Find the eighteenth term of the A.P: 1, 7, 13, 19, ............
उत्तर
Here a = 1, d = t2 - t1 = 7 - 1 = 6
tn = a + (n - 1) d
t18 = 1 + (18 - 1) (6)
= 1 + 17 (6)
= 1 + 102
t18 = 103
The Eighteenth term is 103
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