B1 : 8 1 18(a) 4 or 0.6667 3 (b) B2 : or 4 + = 11 B1 : 19(a) 4x-12 1 3 3 1 (b) -18 1 (c) 20 3 3 B2 : 15 B1 : or 840 21 (a) 2 4 B1 : 7P4 or 7x6x5x4 (b) 2 480 B1 : 6P3 x 4P1 or 6x5x4x4 22(a) = 4.6 1 4 1 (b) 2 and B1 : or or 23(a) 1 3 or or 0.75 2 (b) B1 : P(A= Question Solutions and marking scheme Sub Full Marks Marks 2 24(a) 3 B1 : 6k +2(4k) +2k =1 (b) 1 25(a) 1.25 2 4
B1 : 18(a) (b) 8 or 0.6667 B2 : or 4 + = 11 B1 : 1 3 4 19(a) (b) (c) 4x-12 3 -18 1 1 1 3 20 B2 : 15 B1 : or 3 3 21 (a) (b) 840 B1 : 7P4 or 7x6x5x4 480 B1 : 6P3 x 4P1 or 6x5x4x4 2 2 4 22(a) (b) = 4.6 and B1 : or or 1 1 2 4 23(a) (b) or or 0.75 B1 : P(A= 1 2 3 Question Solutions and marking scheme Sub Marks Full Marks 24(a) (b) B1 : 6k +2(4k) +2k =1 2 1 3 25(a) 1.25 2 4