reto wrote:
In a certain sequence the term an is given by the formula:
\(a_n=a_{n−1}+2n-1\) for all integer \(n>1\). If \(a_7=49\), what is \(a_1\)?
A. −1
B. 0
C. 1
D. 2
E. 3
If \(a_7=49\), just subustutute the value in the series and back solve it, while solving you will notice that for
this part
a_n =a_{n−1}+
2n-1 there will be a difference of 2
49 = a6 +13
36 = a5 + 11
25 = a4 + 9
16 = a3 + 7
9 = a2 + 5
4 = a1 + 3
a1 = 1
C
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Quote which i can relate to.
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