Your grades literally do not matter in anything before yr12 (for ATAR/ HSC mark purposes, maybe for discipline/skill you do)
For example, I got a C in prelim 2u but got a 98 hsc mark. Shit doesnt matter
Yeah I’m lowkey cooked I forgot to check numbers
the question should be divisible by 5 for odd integers n, as the -2^n from the binomial only exists (and thus cancels with 2^n) when n is odd, otherwise it’d be +2^n
anyway that should be the easiest way to prove it since yk (-1)^odd = -1
4. maybe consider 3 = 5-2 then binomial, tho idk if that give remainder of 0, thus divisible by 5 (including base case)
1. x^n-1 = (x-1)(1+x+x^2 +…+x^n-1)
english standard has:
1. selection bias, people good at english would prob take english advanced
2. awful alignment
3. math standard is genuinely easy as hell, aint comparable to anything english related.