Question 1190815
<br>
Number of terms in an arithmetic sequence:
(last minus first), divided by the common difference, plus 1:<br>
{{{((t-1)/t-1/t)/(2/t)+1=((t-2)/t)*(t/2)+1=((t-2))/2+1=(t/2-1)+1=t/2}}}<br>
ANSWER: t/2<br>