CBSE Class 10-Mathematics: Chapter –15 Probability Part 1

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Question 1:

An integer is chosen at random from the first two hundreds digit. What is probability that the integer chosen is divisible by .

Answer

Multiples of first 200 integers

Multiples of first 200 integers

Number of Multiples of or

P(Multiples of

Question 2:

A box contains balls out of which are black. If one ball is drawn at random from the box what is the probability that it will be a black ball? If more black balls are out in the box. The probability of drawing a black ball is now double of what it was before. Find .

Answer:

Total number of balls

Let the number of black balls be .

P(drawing a black ball)

It is given that 6 more black balls are put in the box.

Now, we have:

Total number of balls

Number of black balls

P (drawing a black ball)

Therefore, we have:

Question 3:

A bag contains red balls and blue balls, the odd against drawing a blue ball are 2:5. What is the value of ?

Answer:

No. of blue balls be

No.of red balls be Total no. of balls

Probability of drawing blue balls

.

Question 4:

A card is drawn from a well shuffied deck of cards

i. What are the odds in favour getting spade?

ii What are the odds against getting a spade?

iii. What are the odds in favour of getting a face card?

iv. What are the odds in favour of getting a red king

Answer:

Total cards

Spade

Remaining cards

i. The odds in favour of getting spade

The odds is not favour of getting spade

ii. The odds against getting a spade

The odds not against getting a spade

iii. The odds in favour of getting a face card

The odds not in favour of getting a face card

iv. The odds in favour of getting a red king

The odds not in favour of getting a red king