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Mathematics

Determine the A.P. whose 3rd term is 16 and the 7th term exceeds the 5th term by 12.

AP

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Answer

Given,

⇒ a3 = 16

⇒ a + (3 - 1)d = 16

⇒ a + 2d = 16 ………(i)

Given,

⇒ a7 - a5 = 12

⇒ [a + (7 - 1)d] - [a + (5 - 1)d] = 12

⇒ (a + 6d) - (a + 4d) = 12

⇒ a - a + 6d - 4d = 12

⇒ 2d = 12

⇒ d = 6.

Substituting value of d in (i) we get,

⇒ a + 2(6) = 16

⇒ a + 12 = 16

⇒ a = 4.

A.P. = a, (a + d), (a + 2d), ……….

= 4, (4 + 6), (4 + 2(6)), ………

= 4, 10, 16, ………

Hence, A.P. = 4, 10, 16, ………

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