Number System I. 3x2-14x + 8 = 0 II. 2y2 - 1 7 y + 36 = 0 if x < y if x >= y if x > y if x <= y if x < y if x >= y if x > y if x <= y ANSWER EXPLANATION DOWNLOAD EXAMIANS APP l. 3x2 - 12x - 2x + 8 = 0or 3x(x - 4) -2 (x -4) = 0∴ x = 4, 2/3ll. 2y2 - 8y - 9y + 36 = 0or 2y (y - 4) -9 (y - 4) = 0or (2y - 9) (y - 4) = 0∴ y = 4, 9/2
Number System Supply the missing figure : 1, 4, 9, 16, 25 .... 49 42 23 16 36 42 23 16 36 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 36
Number System Twenty times a positive integer is less than its square by 96. What is the integer? 24 20 Cannot be determined 30 24 20 Cannot be determined 30 ANSWER DOWNLOAD EXAMIANS APP
Number System What is the sum of all the composite numbers up to 20? 132 128 131 130 132 128 131 130 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132
Number System 1256+4813+765=? 6836 6831 6834 6839 6836 6831 6834 6839 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1256+4813+765= 6069+765=6834
Number System A box contains 5 red, 4 black and 4 blue balls. If 3 balls are drawn randomly from the box, what is the probability that there are exactly 2 blue balls in the three drawn balls ? 27/143 30/146 28/144 29/145 27/143 30/146 28/144 29/145 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total balls = 5 + 4 + 4 = 13∴ n(S) = 13C3 = 2862 blue balls can be selected from 4 balls in 4C2 = 6 ways and the remaining one ball is to be selected from 9 balls in 9C1 = 9 ways ∴ n(E) = 6 x 9∴ P(E) = 6 x 9/286 = 27/143
EXAMIANS