Number System Find the least value of 3x + 4y if x2y3 = 6. 7 10 6 3 7 10 6 3 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System (2560 x 1.4) +(7400 x 0.6) =? 6543 7234 8024 9160 6543 7234 8024 9160 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8024
Number System √343 = ? 21 18 19 20 21 18 19 20 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = √343 = 18
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 ? 45/340 58/340 39/340 51/340 45/340 58/340 39/340 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 In how many different ways can the letters of the word 'LEASE' be arranged ? 40 80 60 None of these 40 80 60 None of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The world LEASE consists of 5 letters in which E comes twice ∴ 51/21 = 5x4x3x2x1/2x1 = 60
Number System If (72)² is subtracted from the square of a number, the answer thus obtained is 4617. What is the number ? 99 95 92 103 99 95 92 103 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (72)² = 467Therefore, x² = 4617 + 5184Therefore, x² = 9801 Therefore, x = 99
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