Number System If a + b = 16 and ab = 68, what is the value of a² + b² ? 124 112 116 120 124 112 116 120 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP a + b = 16 Therefore, (a+b)² = (16)² = 256 a² + b² + 2ab = 256Therefore, a² + b² = 256 - 2 x 68Therefore, a² + b² = 256 - 136 = 120
Number System A number consists of 3 digit whose sum is 10. The middle digit is equal to the sum of the other two and the number will be increased by 99 if its digits are reversed. The number is: 370 145 352 253 370 145 352 253 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the middle digit be x. Then, 2x = 10 or x = 5.So, the number is either 253 or 352. Since the number increases on reversing the digits, so the hundred's digit is smaller than the unit's digit. Hence, required number = 253.
Number System What number should replace both the question marks (?) in the following question ? 82 85 83 84 82 85 83 84 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 84
Number System 56.21 +2.36+5.41 —21.4+1.5=? 54.08 34.08 44.08 64.08 54.08 34.08 44.08 64.08 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 44.08
Number System √(17)² + (17)² + (5)² - 2 = ? 19 17 18 16 19 17 18 16 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = √49 + 289 + 25 - 2 = √361 = 19
Number System In how many different ways can the letters of the word 'FRUGAL'be arranged ? 720 660 515 556 720 660 515 556 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In FRUGAL there ae six difference letters Therefore, 6 ! = 6 x 5 x 4 x 3 x 2 x 1 = 720
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