Number System Which one of the following is the sum of the numbers 1, 3, 5, 7, 9…. up to nth number? N(N + 1)/2 N2 + 1 N2 N(N + 1) N(N + 1)/2 N2 + 1 N2 N(N + 1) ANSWER DOWNLOAD EXAMIANS APP
Number System If 2^(2x-1) = 8^(3-x), then the value of x is: 2 5 6 9 2 5 6 9 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2
Number System The average of five consecutive even numbers A, B, C, D and E is 54. What is the product of'B' and 'E' ? 3016 2871 4098 1456 3016 2871 4098 1456 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Because, The even numbers are consecutive and their average is 54.∴ The number C will be 54.∴ A = 50, B = 52, D = 56, E = 58B x E = 52 x 58 = 3016
Number System In how many different ways can the letters of word 'BIOLOGY' be arranged ? 2520 2678 2410 2367 2520 2678 2410 2367 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In BIOLOGY total 7 letters are there but O comes twice.∴ Number of arrangements = 7!/2! = 2520
Number System 64% of 2650+40% 0f 320=? 2096 1824 1578 1247 2096 1824 1578 1247 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1824
Number System A number when multiplied by five times of itself give the value equal to 1445. What is the number ? 18 15 17 16 18 15 17 16 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x x 5x = 1445= 5x² = 1445= x² = 289∴ x = 17