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प्रश्न
Find n if the nth term of the following A.P. is 68
5, 8, 11, 14, ..........
उत्तर
Given that
a = 5, d = 3, `t_n = 68`
`t_n = a + (n-1)d`
68 = 5 + (n -1)3
63 = (n-1)3
n -1 = 21 ⇒ n = 22
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