yeh i think lucid's working out for Q10 is wrong, bc u cant just say 2! for organising the teachers bc they are aligned in an isosceles triangle formation, and thus where you place the first teacher matters. What I did instead was chose a student (5C1) to place down as the student who was on...
I got 10 as B, because I realised that since no more than 2 students can sit together, the general pattern must be the following, and then i worked from there (can someone verify dis)
for 16a), instead of using mok's method which seems like the right one, I assumed that the centres of the triangles was the origin, and just worked with c = (e^(i2π/3))b and a = (e^(-i2π/3))b. How many marks do u guys think i would lose given ii) is 2 marks and iii) is 3 marks?
(from Mok's...
(I just typed this up real quick so idk if i made a mistake or not I will relook through it now, hopefully this makes sense)
So, when the magnitude of (p + q) is a minimum is when q is antiparallel to p (which just means that p is parallel to q but they point in opposing directions), as you...