CBSE 4 chapters

Probability of Sure event is

• 0

• 1

• -1

• 2

Which of the following formula is not Correct ?

HCF of 2 Prime numbers are

• 1

• 2

• 4

• 3

Which of the following is a rational number?

Eight coins are tossed together. The probability of getting exactly 3 heads is     

• 1/ 256 
• 3 /32
• 7/ 32
• 5/ 32

From a pack of 52 cards, a cards is drawn, what is the probability that the card is red?  

A box contains 20 electric bulbs, out of which 4 are defective. A bulb is chosen at random from this box. What is the probability that it is defective?

HCF of (126,156)

A quadratic polynomial whose zeros are -3 and 4 are