Angles 3 and 4 are both supplementary angles. They both add up to 180 degrees. So, if you know one of them then you can just do 180-measure of angle 3. 180-76=104 degrees
# of ways to succeed: 10*10*10*3*25*25--# of possible plates: 10*10*10*26*26*26----P(exactly one W) = [10^3*3*25^2]/[10^3*26^3] = 3*25^2/26^2 = 1875/17576
