94-S1-Q3 Read more about 94-S1-Q3 Binomial expansion, coefficient, sum, even and odd. [STEP I 1994 Question 3 (Pure)]
90-S1-Q2 Read more about 90-S1-Q2 Complex numbers, modulus and argument, roots of unity, binomial expansion, sum. [STEP I 1990 Question 2 (Pure)]
