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 ? 92/190 90/190 89/190 91/190 92/190 90/190 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 65 x 288 ÷ 52 = 1.8 x ? 210 190 200 180 210 190 200 180 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 65x288/52x1.8 = 200
Number System Supply the missing figure : 1, 4, 9, 16, 25 .... 49 42 16 36 23 42 16 36 23 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 36
Number System Find the least value of 3x + 4y if x2y3 = 6. 10 6 3 7 10 6 3 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System If the fractions 1/7, 3/5, 2/5, 5/6 and 9/11 are arranged in descending order of their values, which one will be the fourth number? 4/5 3/5 1/5 2/5 4/5 3/5 1/5 2/5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1/4 = 14. 3/5 = 6.2/5 = 4.5/6 = 83.9/11 = 82.Therefore, 83 > 82 > 6 > 14
Number System In how many different ways can the letters of word "COLLEGE" be arranged ? 1260 1280 1240 1300 1260 1280 1240 1300 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Number of ways = 7!/2!2! = 1260(∵ L and E come twice)
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