Number System An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white ? 90/190 92/190 89/190 91/190 90/190 92/190 89/190 91/190 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total possible outcomes = 20C2 = 20 x 19/1 x 2 = 190Total favourable outcomes = 7C1 x 13C1 = 7 x 13 = 91∴ Required probability = 91/190
Number System How many figures are required to number the pages the pages of a book containing 365 pages? 967 987 897 977 967 987 897 977 ANSWER DOWNLOAD EXAMIANS APP
Number System Find the least value of 3x + 4y if x2y3 = 6. 6 10 3 7 6 10 3 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System 6.4 x 8.5 x 25/3.2 x 12.5 = ? 4.5 3.4 2.3 5.6 4.5 3.4 2.3 5.6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 6.4 x 8.5 x 2.5/3.2 x 12.5 = 3.4
Number System Supply the missing figure : 1, 4, 9, 16, 25 .... 49 36 42 16 23 36 42 16 23 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 36
Number System What is the sum of all even numbers from 1 to 701? 122850 122500 123850 122550 122850 122500 123850 122550 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 700/2 = 350350 * 351 = 122850
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