a$)$ Master Method

$$ i$.$ Explain in which situations the master method is not suitable and why

$$ ii$.$ If two different problems have the same values for a$,$ b and d $($from our course equations$)$ then explain what does this mean?

$$ iii.$$ Consider two different problems p$1$ and p$2.$ Let us say for p$1,$ a $=$ a$1,$ b $=$ b$1$ and d $=$ d$1$ and for p$2,$ a $=$ a$2,$ b $=$ b$2$ and d $=$ d$2.$ Explain how the solutions compare if a$1=$ a$2,$ d$1=$d$2,$ however, b$1<$ b$2$