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प्रश्न
Find the indicated terms in each of following A.P.s: 1, 6, 11, 16, …; a20
उत्तर
1, 6, 11, 16, …
Here, a = 1, d = 6 – 1 – 5
a20 = a + (n – 1 )d
= 1 + (20 – 1) x 5
= 1 + 19 x 5
= 1 + 95
= 96
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