CBSE Class 10-Mathematics: Chapter – 15 Probability Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)
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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