Click to Chat

1800-2000-838

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Arnab Purkayastha Grade: 12
```
four balls are there
i pick up two balls out of them
two of them are white
what is the probability that all of them are white?
```
6 years ago

## Answers : (5)

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,
Required probabilty=2/4=1/2

Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
Win exciting gifts by                                                                                                                                                                                                                                answering             the                               questions              on                                            Discussion                                          Forum.         So                             help                                                 discuss                                any                                                   query             on                                               askiitians                        forum         and                                      become         an                             Elite                                                  Expert                           League                                                              askiitian.

Sagar Singh
B.Tech, IIT Delhi

```
6 years ago
510 Points
```										total balls = 4
white balls = 2
probablity that  white ball is taken out = 2/4= 1/2
now only 1 white ball is remaining
total balls = 3
probablity that white ball is taken out = 1/3
total probablity = multiplication of both = 1/6
1/6 is the required ans
```
6 years ago
Mir Noaman Ali IIT-Roorkee
57 Points
```										probability = favourable /total cases   in this case favourable case is choosing 2 white out of 4 white nd total is choosing 2 white out of 2white nd 2 of sum oder colour + choosing 2 white out of 3white and 1 of sum oder colour nd choosing 2 white out of 4 white hence 4c2 / (4c2 + 3c2 + 2c2) calculating it we get 6/11  approve the answer if u have understood the solution
```
6 years ago
Mir Noaman Ali IIT-Roorkee
57 Points
```										probability = favourable /total cases   in this case favourable case is choosing 2 white out of 4 white nd total is choosing 2 white out of 2white nd 2 of sum oder colour + choosing 2 white out of 3white and 1 of sum oder colour nd choosing 2 white out of 4 white hence 4c2 / (4c2 + 3c2 + 2c2) calculating it we get 6/10 = 3/5   approve the answer if u have understood the solution ..............
```
6 years ago
Sudheesh Singanamalla
114 Points
```										Number of balls = 4
number of balls picked = 2
colour of 2 balls picked = white
the probability that all of them are white is 1
because
1. all 4 could be white
2. 3 white , 1 of another colour
3. 2 white and 2 of one colour each
the number of white balls could be either 2 or 3 or all 4 of them !
so probabilty that all of them are white is 1/2 or 3/4 or 1
since we get 2 white balls out of 2 balls we pick , the probabilty is 2/2 = 1

```
6 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

## Other Related Questions on Algebra

View all Questions »
• Complete JEE Main/Advanced Course and Test Series
• OFFERED PRICE: Rs. 15,900
• View Details