Number System In a two-digit number, the digit in unit's place is two more than three times the digit in ten's place. If the sum of the two digits is 10, what is the number ? 18 22 24 28 18 22 24 28 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ y = 3x + 2 .......(i)And, x + y = 10 ......(ii)From (i) and (ii), x = 2, y = 8∴ Number = 28
Number System 106 * 106 - 94 * 94 = ? 1904 1906 2400 2000 1904 1906 2400 2000 ANSWER DOWNLOAD EXAMIANS APP
Number System What is the sum of all the prime numbers from 20 to 40? 117 120 119 118 117 120 119 118 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 23 + 29 + 31 + 37 = 120
Number System If A = 1, B = 3, C = 5 and so on, what do the numbers 3, 9, 7 stand for BAT BED CAT CAR BAT BED CAT CAR ANSWER EXPLANATION DOWNLOAD EXAMIANS APP BED
Number System Complete the series : 81, 69, 58, 48, 39 ........ 31 29 30 28 31 29 30 28 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 31
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 ? 34/55 31/58 37/52 32/51 34/55 31/58 37/52 32/51 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
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