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 August 4th, 2014, 11:57 AM #1 Newbie   Joined: Aug 2014 From: SA Posts: 1 Thanks: 0 Arithmetic Progression hi guys really need help with this question. Given that T(7)=23, T(n)=43 and T(2n)=91 for an A.P., find a, d and n. thanks good luck. Ray
August 4th, 2014, 12:48 PM   #2
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Quote:
 Originally Posted by raymondbello Given that T(7)=23, T(n)=43 and T(2n)=91 for an A.P., find a, d and n.
T(7) = 23 : a + 6d = 23 [1]

T(n) = 43 : a + d(n - 1) = 43 [2]

T(2n) = 91 : a + d(2n - 1) = 91 [3]

3 unknowns, 3 equations....so the ball's in your court ...

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