| Q1) Which of the following numbers are prime? 1) 57 2) 91 3) 79 4) 84
Clearly, 79 is a prime number. Hence, Option 3. Q2) What is the sum of first 5 prime numbers? 1) 28 2) 18 3) 23 4) None of these
First five prime numbers are 2, 3, 5, 7, 11. Hence, Option 1. Q3) 1403 × 1403 = ? 1) 1968409 2) 19609 3) 1960009 4) 196009
(1403)2 = (1400 + 3)2 = 14002 + 32 + 2(3)(1400) = 1960000 + 9 + 8400 = 1968409 Hence, Option 1. Q4) Find the largest 4 digit number that is divisible by 7? 1) 9996 2) 9997 3) 9995 4) 9993
Divide 9999(Largest 4 digit number) by 7 and get remainder 'R'. R = 3. ∴ Required number is (9999 - R) = (9999 - 3) = 9996 Hence, Option 1. Q5) Find y such that: y + 2799 - 1685 + 1499 = 3780 1) 795 2) 3380 3) 1167 4) None of these y + 2799 - 1685 + 1499 = 3780 y + 2613 = 3780 y = 1167 Hence, Option 3. Q6) Which of the following numbers is divisible by 4. 1) 123456 2) 241370 3) 234562 4) None of these
A number is divisible by 4 if last two digits of a number are divisible by 4. Hence, option 1. |