Number System If the average of two numbers is 88.5 and one number is 5.5 less than the average. Find out the next number. 97 86 91 94 97 86 91 94 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 94
Number System How many figures are required for numbering the pages of a book containing 1000 pages? 3892 2893 2883 6489 3892 2893 2883 6489 ANSWER DOWNLOAD EXAMIANS APP
Number System In how many different ways can the letters of the word "MOBILIZE" be arranged ? 18456 19765 20160 17453 18456 19765 20160 17453 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160
Number System The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is: 289/290 290/289 1/289 289 289/290 290/289 1/289 289 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be a and b. Then,ab = 17, a = 1 and b = 17So, 1/a2 + 1/b2 = (a2 + b2)/a2 b2 = (12 + 172)/(1 * 17)2 = 290/289
Number System The Twenty-First Century will start on January 1 in the year 2000 2101 2001 2100 2000 2101 2001 2100 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2001
Number System If the sum of five consecutive even numbers A, B, C, D and E is 130, what is the product of A and E ? 720 780 660 840 720 780 660 840 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the consecutive even numbers be A = 2x, B = 2x + 2, C = 2x + 4, D = 2x + 6 and E = 2x + 8= A + B + C + D + E = 130= 10x + 20 = 130∴ x = 130 - 20/10 = 11Therefore, product of A and E= 22 x 30 = 660
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