# 9 - Probability Questions Answers

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**Question 1:- what is the number of ways in which one can post 5 letters in 7 letter boxes?**

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**(a) 7**^{5} (b) 3^{5} (c) 5^{7 } (d) 2520

^{5}(b) 3

^{5}(c) 5

^{7 }(d) 2520

**Asked By: SWATI KAPOOR**4 year ago

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1) There are 20 balls which are red,blue or green.If 7 balls are green & the sum of red balls & green balls is less than 13,atmost how many red balls are there?

2)A drawer holds 4 red hats & 4 blue hats.what is the probability of getting exactly three red hats or exactly three lue hats when taking out 4 hats randomly out of the drqwer & immediately returning every hat to the drawer before taking out the next?

3)In how many ways can we distribute 10 identical looking pencils to 4 students so that each students gets at least one pencil?

4)Mr &mrs smith have invited 9 of their friends & their spouses for a party at the waikki beach resort.they started for a group photograph.if Mr.smith never stands next to mrs smith(as he says they are always together otherwise).how many ways the group can be arranged in a row for the photograph?

**Asked By: KUSHAL KUMAR**5 year ago

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how to i know ,ece department m4 maths in engineering.

**Asked By: PRASANTH**6 year ago

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We have to select 2 numbers from 1 to 9. Probability that the product of these 2 numbers is 12, will be

**Asked By: MUHAMMAD NADEEM HAIDER NASEEM**6 year ago

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Paddy is flipping a weighted coin, which displays heads with a probability of

**Asked By: MUHAMMAD NADEEM HAIDER NASEEM**6 year ago

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total no.of methods to divide 52 cards in 4 groups are x. what will be the value of x ?

**Asked By: SYED ASHWAQ AHMED**6 year ago

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**Asked By: SAHDEV SINGH**7 year ago

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**Answer Strategies and trick by Manish sir**(it will help you to solve it by yourself)

1) (10/12)(9/11)(8/10)(7/9)

2) 4(10/12)(9/11)(8/10)(2/9)

3) (4*3/2)(10/12)(9/11)(2/10)(1/9)

4) 1 - (10/12)(9/11)(8/10)(7/9)