Number System What should come in the place of ' ? ' in the following number series ? 2, 5, 9, 19, 37, ? 78 75 76 77 78 75 76 77 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
Number System The sum of the present age of a father and a son is 60 years. Five years before, the age of the father was four times that of son. What is the present age of the son ? 21 years 15 years 18 years 25 years 21 years 15 years 18 years 25 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the father's age be x and son's age yTherefore, x + y = 60 ....................(i)Five years back, (x - 5) = 4 (y - 5)x - 4y = - 15 ......................(2)Solving (1) and (2), x = 45 and y = 15
Number System What is the sum of all the composite numbers up to 20? 131 130 128 132 131 130 128 132 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132
Number System (12.04 x 7.5 + 0.8 x 45) ÷ 3 = ? 42.6 42.1 45 54.7 42.6 42.1 45 54.7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (90.3 + 36) ÷ 3 = 126.3/3 = 42.1
Number System In how many different ways can the letters of the word "MOBILIZE" be arranged ? 18456 17453 19765 20160 18456 17453 19765 20160 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160
Number System Supply the missing figure : 2, 6, 12, 20, 30 ... 56 41 39 42 40 41 39 42 40 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 42
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