Number System What is the sum of all the composite numbers up to 20? 132 130 128 131 132 130 128 131 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132
Number System In how many different ways can the letters of word "SENTENCE" be arranged ? 6460 3360 3260 2360 6460 3360 3260 2360 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Number of ways = 8!/3! 2! = 40320/12 = 3360
Number System Which one of the following represents the sum of the first n even numbers? N(N – 1) N2+ 1 N(N + 1) N2 N(N – 1) N2+ 1 N(N + 1) N2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
Number System The sum of two numbers is 165 and the difference between them is 9. What is the average of these two numbers ? 84.5 83.5 82.5 85.5 84.5 83.5 82.5 85.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 165x - y = 92x = 174 ∴ x = 87 and y = 78∴ x + y/2 = 165/2 = 82.5
Number System If the difference between a number and its 2/5 is 240, find the number. 400 440 360 480 400 440 360 480 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be x Therefore x - 2x/5 = 240, Therefore, 3x/5 = 240Therefore, x = 240x5/3 = 400
Number System 50% of 8/15 of 9/4 of 5/3 of 333 = ? 555 666 333 444 555 666 333 444 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 50% of [8x9x5/15x4x3 x 333]= 50% of 666= 333
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