Subject: Math, asked on 28/1/18

## Consider the experiment in which a coin is tossed repeatedly until a head comes up. Describe the sample space.

Subject: Math, asked on 18/1/18

## A dice is tossed "until 6 is obtained"find the probability that it is obtained in second throw by using sample space (by using sample space probability comes out to be 1/6 as (6,1),(6,2)..... would not appear in sample space but similar question which came in jee had its answer as 1/6 * 5/6because it concidered (6,2)...... as a possibility please explain why)

Subject: Math, asked on 15/1/18

## Two nos are selected at random from the first 20 natural number . Find the probability in which bith are prime

Subject: Math, asked on 7/1/18

## A coin is tossed and a die is thrown . Find the probability of selecting that outcomes will be a tail or a number greater than 3.

Subject: Math, asked on 6/1/18

## Without repetition of the numbers , four digits numbers are formed with the numbers 0,2,3,5 . Find the probability such a number is divisible by 5.

Subject: Math, asked on 4/1/18

## from a well shuffled deck of 52 cards.find the probability of not getting an ace

Subject: Math, asked on 2/1/18

## Aolve this 4 one ​Q4. The probabilities that a student will receive an A, B, C and D grade are 0.30, 0.38, 0.22 and 0.10 respectively. What is the probability that the student will receive.      (i) at least B grade                                            (ii) at most C grade      (iii) not an A grade                                           (iv) B or C grade     What should be done a student getting A grade ?

Subject: Math, asked on 5/12/17

## A,B and C are three mutually exclusive and exhaustive events. IfP(A)=2/7 and P(B)=1/7 then find P(C)

Subject: Math, asked on 30/11/17

## Solve this: Example.3: Two numbers are randomly selected from the first 100 natural numbers. The probability that the product of the numbers is divisible by 7 is

Subject: Math, asked on 30/11/17

## Example.1: If 15 boys of different ages are distributed into 3 groups of 4, 5 and 6 boys randomly then the probability that three youngest boys are in different groups is (a) $\frac{24}{91}$ (b) $\frac{71}{91}$ (c) $\frac{67}{91}$ (d) $\frac{20}{91}$

Subject: Math, asked on 15/11/17

## In throwing of a die, let A be the event 'an odd number turns up' , B be the event 'a number divisible by 3 tums up' and C be the event 'a number $\le$ 4 turns up'. Then find the probability that atleast two  of B and C occur.

Subject: Math, asked on 21/10/17

## A student appears for JEE mains exam.He is totally unprepared. He decides to guess every question in the exam and he will mark every answer without even reading the question(totally random).The marking rules remain the same +4 marks for right answers and -1 for wrong answers. what is the probability that he passes(marks above 100)? P.S ~ Just asking this question to solve out of curiosity don't think I am in such a situation and this is a nice question as well.

Subject: Math, asked on 7/10/17

## Ques. 22 pls Q.22. There are three events A, B, C one of which must happen at a time. If the odds are 8 to 3 against A; 5 to 2 against B, find the odds against C.

Subject: Math, asked on 12/8/17

## . A box contains 4032 answer scripts out of which exactly half have odd number of marks. We choose 2 scripts randomly and, if the scores on both of them are odd number, we add one mark to one of them, put the script back in the box and keep the other script outside. If both scripts have even scores, we put back one of the scripts and keep the other outside. If there is one script with even score and the other with odd score, we put back the script with the odd score and keep the other script outside. After following this procedure a number of times, there are 3 scripts left among which there is at least one script each with odd and even scores. Find, with proof, the number of scripts with odd scores among the three left.

Subject: Math, asked on 26/4/17

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