Question 990456
In an AP (arithmetic progression, or arithmetic sequence),
{{{a[1]}}}= the first term,
{{{d}}}= the common difference (the difference between consecutive terms), and
{{{a[n]=a[1]+(n-1)*d}}}= the nth term ,
but we do not need to know any of that to answer the question.


To find the 15th term, we substitute {{{n=15}}} in {{{4n-5}}} ,
to find that the value of the 15th term is
{{{4*15-5=60*5=highlight(55)}}} .