[tex]\displaystyle \\
a) \\
n_{1(L142)} = 2(142-1) = 2 \times 141 = \boxed{282} \text{ (primul numar din linia 142)}\\ \\
b) \\
n_{t (UL)} = 2\left(\frac{2008-2}{2}+1\right) +1 = \\ \\
=2\left(\frac{2006}{2}+1\right) +1 =2\left(1003+1\right) +1 = \\ \\ =2\left(1004\right) +1 =2008+1 = \boxed{2009}\text{ (numar de termei pe ultima linie)}[/tex]
