Number System The sum of two numbers is 25 and their difference is 13. Find their product. 114 104 315 325 114 104 315 325 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then x + y = 25 and x - y = 13.x = 19; y = 6xy = 19 * 6 = 114
Number System What is the missing number in this series? 8 2 14 6 11 ? 14 6 18 12 3 7 2 9 3 7 2 9 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 9
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 45/340 58/340 51/340 39/340 45/340 58/340 51/340 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 What least number shall be added to 4700 to make it a perfect square ? 61 91 71 81 61 91 71 81 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.
Number System (1024—263—233)÷(986—764— 156) =? None of these 6 10 8 None of these 6 10 8 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8
Number System The square root of 0.0081 is: 0.91 0.9 0.009 0.09 0.91 0.9 0.009 0.09 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 0.09
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