Number System If a + b = 16 and ab = 68, what is the value of a² + b² ? 116 124 120 112 116 124 120 112 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 A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ? 32/51 37/52 34/55 31/58 32/51 37/52 34/55 31/58 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Probability of having no red ball is9C3 / 12C3 = 21/55Probability of having at least one red ball is 1 - 21/55 = 34/55
Number System What is the sum of all the prime numbers from 20 to 40? 120 119 117 118 120 119 117 118 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 23 + 29 + 31 + 37 = 120
Number System The product of two consecutive odd numbers is 4623. What is the product of the next two consecutive odd numbers ? 5183 7745 8795 6782 5183 7745 8795 6782 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP √4623 = 6767 x 69 = 4623∴ Required product = 71 x 73 = 5183
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
Number System 124, 235, 447, 760, 1174, ? 1389 1489 1589 1689 1389 1489 1589 1689 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP +111, +212, +313, +414
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