Thursday, May 9, 2013

Determine which term of the sequence 3,5,7 is equal to 27

arithmetic sequence...
d=2, a1=3, an=27, n=?

a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad
becomes...
27=3%2B%28n-1%29%2A2

2%28n-1%29=24%7D%7D%0D%0A%0D%0A%7B%7B%7Bn-1=12

so n=13 i.e.
27 is the 13-th term
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