I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and chances that I get a pair of red socks is 1/2.
What is the chance of picking a pair of blue socks?
zero
I had 3 red socks and 1 blue sock.
=> chances of pair of red socks = 1/2
chances of pair of mixed socks = 1/2
chances of pair of red socks = NULL
I purchased an awesome ice cream cone having 5 different flavor scoop.
Five flavors are pistachio, mint-chip, strawberry, marshmallow, and raspberry
I will give u some clues so that you can figure out the order of flavors from bottom to top.
1. The bottom flavor of the cone has 10 letters.
2. The marshmallow scoop is at between pistachio and the mint-chip scoop.
3. marshmallow is the raspberry scoop but below the mint-chip scoop.
So can you figure out the flavor of ice cream in order from bottom to top
From bottom to top, the flavors are :
Strawberry
raspberry
pistachio
marshmallow
mint-chip
According to number theory of mathematics , a perfect number is a positive integer that is equal to the sum of its positive divisors excluding the number itself.
For example :
6 => 1+2+3
28 =>1+2+4+7+14
I know one more number that is a perfect number and contains not more than 2 digits (i.e 496 won't be consider as it contains 3 digits).
Find the number ?
12=> 1+2+3+6
cannot be 1 (as number cannot be included)
Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that sum of the numbers of each group is equal?
Note: 9 cannot be turned over to make it 6.
1 2 3 4 5 9 and 7 8 9
sum of numbers 1 2 3 4 5 6 7 8 9 is 45 , so numbers cant be split into 2 equal parts.
I know i cant turn 9 upside down and make it 6 but i can turn 6 to make it 9.
Like an usual car, my new i10 car has 5 wheels(2 front + 2 Rear + 1 spare).
The rear wheel of the car will wear out after 21000 kilometers and the front wheel will wear out after 29000 kilometers.
What is the maximum distance I can cover assuming changing of wheels is not an issue?
Maximum distance: 30,450 kilometers.
For every 5 kilometers driven using this rotation, each tire will lose (2/29000)+(2/21000) of its tread.So, suppose we drive 5*N kilometers like this. Then, each tire will lose 2*N*((1/29000)+(1/21000)) of its tread. We wish to determine N so that the latter expression gets to be 1, representing all of each tire's tread. That happens when N=6090, which is when 5*N (the total kilometers were driven) is 30,450.
I have mixed 13 decks of cards.
What is the minimum number of cards must be taken out from the above mixed cards to guarantee at least one 'four of a kind'.
13 x 3 + 1 = 40
Explanation:
The number of decks is irrelevant i.e any number of decks can be mixed and still the answer would be same.
Any card drawn will be a Ace,2,3,4,5,6,7,8,9,10,Jack,Queen or King, so there are 13 possibilities each time a card is drawn.
The fastest and luckiest way would need just 4 cards of the same kind.
The slowest way is our solution as it will guarantee a four of a kind.
i.e draw 3 of each kind =>39 cards will be fetched. now next card will guarantee 4 of a kind.
In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.
A visitors 'Anmol' decides to walk through all the flats, he finds all the flats except flat-62.
Anmol later founds that the local of the town have given it another name.
What is the name of the Flat ?
One Minute flat
flat 62 => Sixty second flat => One minute flat
A sea diver is a real show off.
He showed everyone that he can hold his breath under water for 15 minutes.
I went to the diver and told him that i can be under water for double the time i.e 30 minutes.
He responded that he will give me 1000$, if i would be able to do it.
I won the 1000$.
what did i do ?
I filled a glass full of water and held it over my head for 30 minutes.
This was asked in an interview of Infosys.
Interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.
And When he come back, he will draw a marble from any of the two box and if the marble is black i will be hired.
Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.
So whats should i have done ?
One black marble in one box, the other 99 marbles in the other box
In my garden, i have many trees but only one of them is mango tree.
In this mango trees, there are some mangoes(as expected).
But after a strong wind, there are neither mangoes on tree nor on ground.
Explain ?
Solution
At first, there were 2 mangoes on the tree. After the wind blew, one mangoe fell on the ground. So there where no mangoes on the tree and there were no mangoes on the ground.
*mangoes => more than one mango
Another solution(non tricky one)
The wind blew so hard that the mangoes fell of the tree and blew along the ground.