Number System (12.04 x 7.5 + 0.8 x 45) ÷ 3 = ? 54.7 42.1 45 42.6 54.7 42.1 45 42.6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (90.3 + 36) ÷ 3 = 126.3/3 = 42.1
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 90/190 91/190 92/190 89/190 90/190 91/190 92/190 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 If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 50 48 47 49 50 48 47 49 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
Number System On dividing 2272 as well as 875 by 3-digit number N, we get the same remainder. The sum of the digits of N is: 10 11 13 12 10 11 13 12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Clearly, (2272 - 875) = 1397, is exactly divisible by N.Now. 1397 = 11 * 127The required 3-digit number is 127, the sum of whose digit is 10.
Number System Let R = qs—4. When s=8, R=16. When s=10, R is equal to 23 20 21 22 23 20 21 22 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 21
Number System Three numbers are in ratio of 3: 4 :5. If the sum of first & third numbers is more than second number by 52, which will be largest number? 23 34 65 78 23 34 65 78 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 65
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