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4. The (n – 1)th term of an A.P. is given by 7,12,17, 22,… is (a) 5n + 2 (b) 5n + 3 (c) 5n – 5 (d) 5n – 3

Harshit Singh , 3 Years ago
Grade 12th pass
anser 1 Answers
Pawan Prajapati

Last Activity: 3 Years ago

Answer: d Explaination:Reason: Here a = 7, d = 12-7 = 5 ∴ an-1 = a + [(n – 1) – l]d = 7 + [(n – 1) -1] (5) = 7 + (n – 2)5 = 7 + 5n – 10 = 5M – 3

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