i. A is a set of even natural numbers less than 10.
Listing method: A = {2, 4, 6, 8}
Rule method: A = {x | x = 2n, n e N, n < 5}
ii. B is a set of letters of the word ‘SCIENCE’.
Listing method : B = {S, C, I, E, N}
Rule method: B = {x\x is a letter of the word ‘SCIENCE’}