2 A boy multiplies 987 by a certain number and obtains 559981 as his answer. If in the answer, both 9's are wrong but the other digits are correct, then the correct answer will be : A) 553681 B) 555181 C) 555681 D) 556581
3 When a certain number is multiplied by 13, the product consists entirely of fives. The smallest such number is : A) 41625 B) 42135 C) 42515 D) 42735
9 How many of the following numbers are divisible by 3 but not by 9 ? 2133, 2343, 3474, 4131, 5286, 5340, 6336, 7347, 8115, 9276 A) 5 B) 6 C) 7 D) None of these
10 A number 476**0 is divisible by both 3 and 11. The non-zero digits in the hundredth and tenth place respectively are: A) 7,4 B) 7,5 C) 8,5 D) None of this
11 Which of the following numbers is exactly divisible by all prime numbers between 1 and 17 ? A) 345345 B) 440440 C) 510510 D) 515513
12 The number 311311311311311311311 is : A) divisible by 3 but not by 11 B) divisible by 11 but not by 3 C) divisible by both 3 and 11 D) neither divisible by 3 nor by 11
13 A 4-digit number is formed by repeating a 2-digit number such as 2525, 3232 etc. Any number of this form is exactly divisible by : A) 7 B) 11 C) 13 D) smallest 3-digit prime number
14 The largest natural number which exactly divides the product of any four consecutive natural numbers is : A) 6 B) 12 C) 24 D) 120
15 The least number which must be subtracted from 6709 to make it exactly divisible by 9 is : A) 2 B) 3 C) 4 D) 5