[Bonus problem] 6. (a) [2 points) What is the power set of A={a,b,c}? (b) [0.5x4=2 points) What is the cardinality or size of each of these sets? a) o b) {{{0,1}}} c) {0,{0}, {{9}}} d) {a,b,{@},{,{@}}, { }} (c) [2 points] Multiply the two matrices A and B, i.e. calculate AB, where 2 A= and B = 4 I d) [2 points] What is the floor of the following numbers? (1) 2.6. (ii) -3.0 (iii) 3.0 (iv)