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the 3rd term of an arithmetic sequence is 17, and 9th is 83. what is the 1st term
 one year ago
 one year ago
the 3rd term of an arithmetic sequence is 17, and 9th is 83. what is the 1st term
 one year ago
 one year ago

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mubzzBest ResponseYou've already chosen the best response.2
This is an arithmetic progression (AP) The general formula for any term is \[a _{n} = a _{1} + (n1)d\] a(n) is the term you want, a1 is the first term and 'd' is the difference between terms so for third term, 17 = a1+2d ===> a1 = 172d for 9th term 83 = a1 + 8d Solve the equation simultaneously 83= 17  2d +8d 6d = 66 d = 11 a1 = 17 2(11) = 5 First term is 5
 one year ago
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