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प्रश्न
Find the eighteenth term of the A.P.7.13,19,25,....
उत्तर
A.P. ∴ 7,13,19,25.
Here , a = 7 , d = t2 - t1,
∴ d = 13 - 7= 6
∴ d = 6
∴ tn = a + (n - 1 ) d
∴t18 = 7 + (18 - 1)(6)
= 7 + 17(6)
= 7 + 102
t18 = 109
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