Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 382 396 343 378 382 396 343 378 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is: 28 160 12 180 28 160 12 180 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then, x + y = 20 and x - y = 8x2 - y2 = (x + y)(x - y) = 20 * 8 = 160.
Number System 1827÷ 36 x ?=162.4 3.2 2.6 1.9 4.3 3.2 2.6 1.9 4.3 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3.2
Number System The square root of 3 + “5 is : “3 /2 - 1/”2 “(5/2) + “(1/2) “3 /2 + 1/”2 “5 /2 - 1/”2 “3 /2 - 1/”2 “(5/2) + “(1/2) “3 /2 + 1/”2 “5 /2 - 1/”2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP “(5/2) + “(1/2)
Number System Which choice provides the answer in the following : If 2 * 3 = 36, 5 * 4 = 400, 6 * 2 = 144, 3 * 3 = 81; then, 5 * 5 = ? 525 425 325 625 525 425 325 625 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 625
Number System How many numbers between 300 and 800 can be by using digits 2, 4, 5, 6 and 0 ? 36 52 56 48 36 52 56 48 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∴ Reqd . numbers = 3 x 4P2 = 3 x 12 = 36
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