Balls and bags Probability Questions | probability tricks | Probability Aptitude Tricks

In today's video, we discussed a simple way to solve the probability problems of bags and balls.

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[michaeljeynes]

the first part seems identical to the second part, ,, And the correct analysis is given in the second part. Other comenters also notice first analysis is wrong and give correction equal to that given here for second part, , , , . bizarre

[dimphokemmonye]

Sir, assuming that a ball, is drawn from each box at random, what would be the probability that both balls are red?

[abeerami]

Awesome explanation with Vdo.. In short tym

[MSsatyarout]

Sir what will be the probability of getting a blue ball from first question

[Mrjordancarter]

For part A, why don't you divide the final answer by two as surely the overall probability of getting a red ball overall (31/35 = 0.89- your answer) cannot be higher than the probability of getting a red ball from each bag, bag 1- (3/5 = 0.6) and bag 2- (2/7 = 0.29), to me it makes sense that the final answer represents the average probability of selecting a red across each bag = (bag 1 (0.6) + bag 2 (0.29) /2 = 0.45.

[atulnatekar]

sir can u please upload more videos on probability (types)

[vettripravin]

Very nice Sir
The two bag concept is clearly explained... I hope you more videos like this 👍

[abhinavsingh]

Sir try to make short videos related to aptitude part not more than half an hour because long videos take more time to cover a session...

[mrflibble]

Using the first method, if you calculate the probability of selecting a Blue ball at random, you would get a probability greater than one!!! So that is wrong!
Randomly selecting a red ball would be at probability 5/12 and that of a blue ball 7/12., however, this would not take into account the required initial selection of a bag ( which is not optional) Please comment.

[hsoley]

The first part is wrong! by changing the number of balls in the bags the probability can go over 1 which is impossible!

[bhavyaparikh]

after seeing this video my balls like WTF is this so