Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 343 396 382 378 343 396 382 378 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System If a number is multiplied by. three-fourth of itself, the value thus obtained is 10800. What is that number ? 180 260 60 120 180 260 60 120 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x x 3x/4 = 10800= x² = 10800 x 4/3 = 14400∴ x = √14400 = 120
Number System In how many different ways can the letters of word 'BIOLOGY' be arranged ? 2678 2367 2410 2520 2678 2367 2410 2520 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In BIOLOGY total 7 letters are there but O comes twice.∴ Number of arrangements = 7!/2! = 2520
Number System Complete the series : 11, 12, 17, 18, 23, 24 ... None of these 14 30 12 None of these 14 30 12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP None of these
Number System Two-third of a positive number and 25/216 of its reciprocal are equal. The number is: 5/12 144/25 12/5 25/144 5/12 144/25 12/5 25/144 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,2/3 x = 25/216 * 1/xx2 = 25/216 * 3/2 = 25/144 x = 5/12
Number System What number should replace both the question marks (?) in the following question ? 82 84 85 83 82 84 85 83 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 84
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