Number System In how many different ways can the letters of word 'BIOLOGY' be arranged ? 2678 2410 2367 2520 2678 2410 2367 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 The square root of 3 + “5 is : “(5/2) + “(1/2) “5 /2 - 1/”2 “3 /2 - 1/”2 “3 /2 + 1/”2 “(5/2) + “(1/2) “5 /2 - 1/”2 “3 /2 - 1/”2 “3 /2 + 1/”2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP “(5/2) + “(1/2)
Number System 1256+4813+765=? 6836 6834 6839 6831 6836 6834 6839 6831 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1256+4813+765= 6069+765=6834
Number System If (83)² is subtracted from the square of a number, the answer so obtained is 8487. What is the number ? 179 146 124 163 179 146 124 163 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x Therefore, x² - (83)² = 8487x² = 8487 + (83)²x² = 8487 + 6889x² = 15376Therefore, x² = 15376 x = 124
Number System One half of a two digit number exceeds its one third by 6. What is the sum of the digits of the number? 9 3 5 7 9 3 5 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x/2 – x/3 = 6=> x =63 + 6 = 9
Number System The sum of the ages of a son and father is 65 years. After 5 years the age of father will be double of the age of son. What is the age of son ? 17 years 18 years 20 years 19 years 17 years 18 years 20 years 19 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the age of the son be x and the age of the father be y.Therefore, x + y = 65 ..........(i)or, 2 x (x + 5) = (y + 5)or, 2x + 10 = y + 5or, 2x - y = 5 ...................(ii)From equations (i) and (ii), x = 20, y = 45
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