A good Mathematics textbook contains a lot of
questions for practice
questions for exploration
worked out,examples
theorems and proofs
Consider the following statement. "Every odd natural number is a prime number." Which of the following methods of "proof can be used to prove/disprove the above statement?
Direct proof
Method of disproof
Proof by contrapositive
Proof by contradiction
3
8
4
6
B.
8
In the product of (9x + 15 - x) and ( - 1 - x + x2), if A, B and C are the coefficients of x3, x2 and x respectively, then the value of (A + B - C) is
- 3
14
- 17
11
A person marks his goods 40% above the cost price and allows 40% discount on the marked price. His loss/gain percent is
loss, 8%
No loss/gain
gain, 10%
loss, 16%
Two sides of a right triangle measure 15 cm and 17 cm. Which of the following statements can be true of the length of the third side of the triangle ?
A. It is between 4 cm and 7 cm.
B. It is between 20 cm and 23 cm.
C. It is less than 10 cm
Only B
A and C
A and B
B and C
A tank is in the form of a cuboid. It holds a maximum of 540 m3 water. If the tank is 8 m long and 15 m wide, then how many metres,deep must the water be when the tank is full ?
2
4.5
2.5
3