1. Which of the following is not a sum of consecutive numbers?(a) 12(b) 16(c) 9(d) 11

2. If x, y, z and w are four consecutive numbers and place signs in between the numbers then the number of possible expressions is(a) 3(b) 4(c) 6(d) 8

3. The expression 119 × 332 × 6 is a/an(a) even number(b) odd number(c) prime number(d) None of these

4. Which expression always gives an even number?(a) 4a + 3b(b) a2 + 1(c) 3x + 5 y(d) 2x + 2y

5. The sum of two multiple of 4 is always a multiple of(a) 3(b) 5(c) 7(d) 4

6. Which of these is the factor of 50

7. Two numbers having only 1 as a common factor.

8. The HCF of two co-prime numbers is

9. The HCF of 12 and 16 is

10. The HCF of two consecutive odd numbers is