Number System If (17)3 is subtracted from the square of a number, the answer so obtained is 2143. What is the number ? 84 82 81 83 84 82 81 83 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (17*17*17) = 2143or x² = 2143 + 4913 = 7056∴ x = 84
Number System 1256+4813+765=? 6834 6839 6836 6831 6834 6839 6836 6831 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1256+4813+765= 6069+765=6834
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 ? 58/340 51/340 39/340 45/340 58/340 51/340 39/340 45/340 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 How many numbers between 300 and 800 can be by using digits 2, 4, 5, 6 and 0 ? 36 52 48 56 36 52 48 56 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∴ Reqd . numbers = 3 x 4P2 = 3 x 12 = 36
Number System 65% of 320+?=686 478 481 479 480 478 481 479 480 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 65% of 320+?=686 208+?=686?=686-208?=478
Number System Ratio between two numbers is 3: 4 and their sum is 420. Find the smaller number? 160 180 240 140 160 180 240 140 ANSWER DOWNLOAD EXAMIANS APP