[tex]S=4^{0}+4^{1}+4^{2}+...........+4^{99}+4^{100} = \\ \\ S=1+4^{1}+4^{2}+...........+4^{99}+4^{100} tot*4\\ \\4S=4^{1}+4^{2}+...........+4^{99}+4^{100}+4^{101} \\ \\ 4S=S -1+4^{101} \\ \\ 4S-S=4^{101}-1 \\ \\ S= \frac{ 4^{101}-1}{3} \\ \\ 4^{0}+4^{1}+4^{2}+...........+4^{99}+4^{100} =\frac{ 4^{101}-1}{3} [/tex]