Online Course Discussion Forum
Week 1 Homework Problem #9
I actually got #9 correct (after thinking about it for hours and writing it on my whiteboard multiple times, and maybe writing a python program to do it for me)
My method was setting X and Y to be the base-5 and base-6 counterparts of N, respectively, and setting
N = abc (base 10)
X = defgh (base 5)
Y = jkmn (base 6)
Where the letters denote digits. (i.e. abc could be 243 or 398)
Then from here, remember that
X = 625d + 125e + 25f + 5g + h in decimal
Try converting all of them to decimal. Remember N=X=Y in decimal!
Try getting an equation that relates c, h, and n, and then use the fact that the last 2 digits of S = the last 2 digits of N.
There are probably better solutions.
This is Charles Zhang, signing off for now.