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 ? 89/190 91/190 92/190 90/190 89/190 91/190 92/190 90/190 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 Sum of two numbers is 15. Two times of the first exceeds by 5 from the three times of the other. Then the numbers will be? 6, 9 7, 8 10, 5 9, 6 6, 9 7, 8 10, 5 9, 6 ANSWER DOWNLOAD EXAMIANS APP
Number System (95.6x 910.3) ÷ 92.56256 = 9? 12.24 13.34 15.54 14.44 12.24 13.34 15.54 14.44 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 13.34
Number System If a + b = 16 and ab = 68, what is the value of a² + b² ? 116 124 112 120 116 124 112 120 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP a + b = 16 Therefore, (a+b)² = (16)² = 256 a² + b² + 2ab = 256Therefore, a² + b² = 256 - 2 x 68Therefore, a² + b² = 256 - 136 = 120
Number System 96% of a number is 19584. What is 56% of that number ? 11424 11224 11324 11524 11424 11224 11324 11524 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.According to the question.96% of x = 19584= x = 1958 x 100/96 = 20400∴ 56% of 20400= 20400 x 56/100= 11424
Number System How many figures are required for numbering the pages of a book containing 1000 pages? 6489 3892 2883 2893 6489 3892 2883 2893 ANSWER DOWNLOAD EXAMIANS APP
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