Number System What is the sum of the local values of the digits 2, 3, 4, 5 in the number 2345? 2105 2345 5243 2435 2105 2345 5243 2435 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2000 + 300 + 40 + 5 = 2345
Number System Find the average of the following set of scores 450, 1050, 12, 390, 143, 286, 550, 999 490 480 485 495 490 480 485 495 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Required average score = (450 + 1050 + 12 + 390 + 143 + 286 + 550 + 999) / 8 = 3880 / 8 = 485
Number System A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ? 39/340 51/340 45/340 58/340 39/340 51/340 45/340 58/340 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Total balls = 4 + 6 + 7 = 17∴ n(S) = 17C1 = 680Two red balls can be selected from four red balls in 4C2 = 6 ways.and the third ball can be selected from the remaining 13 balls in 13C1 = 13 ways.∴ P (E) = 13x6/680 = 39/340
Number System In a pair of fractions, fraction A is twice the fraction B and the product of two fractions is 2/25. What is the value of fraction A? 2/5 1/5 1/25 Data inadequate 2/5 1/5 1/25 Data inadequate ANSWER EXPLANATION DOWNLOAD EXAMIANS APP A = 2B => B = 1/2 A, so, AB = 2/25 1/2 A2 = 2/25A2 = 4/25 A = 2/5
Number System The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is: None of these 20 40 30 None of these 20 40 30 ANSWER DOWNLOAD EXAMIANS APP
Number System What should come in the place of ' ? ' in the following number series ? 2, 5, 9, 19, 37, ? 77 78 76 75 77 78 76 75 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2 x 2 + 1 = 5;5 x 2 - 1 = 99 x 2 + 1 = 19: 19 x 2 - 1 = 3737 x 2 + 1 = 75
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