FRIDAY'S KILLER QUESTION: You are attempting to extract 6 balls...

25 March 2011

1 minute read

FRIDAY'S KILLER QUESTION: You are attempting to extract 6 balls...

We're still posting cryptic questions from 7city Learning on alternate Friday afternoons. Add your answers in the comments box at the bottom of the page. We'll add the official answer to the bottom of this article on Monday afternoon. The first correct answer will not win a prize, but will attract great admiration.

Assuming that you are trying to extract 6 balls from a basket of 15, how many combinations and permutations are there?

A 5,005 and 3,603,600 respectively

B 5,005 and 1,816,214 respectively

C 3,603,600 and 5,005 respectively

AUTHOR7cityLearning

Insider Comment

Pr
Pranav
17 June 2011
I'd like to use a lifeline. Computer, could you remove two wrong answers please?
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Ad
Adrian
26 March 2011
A - Order matters with permutations and hence you should have more perms than combs.
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Mr
Mr Pot
26 March 2011
Killer? Is this the standard 7City is at? No wonder we blew the whole system up!
This latest "killer questions" is a test of who remembers which buttons to punch in the calculator, or who can google the answer faster. Right, back to my desk to create the next sbubble then - myabe I will sign up for something at 7City first
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Da
Dave
26 March 2011
I used to be able to answer stuff like that off the bat too...having worked for 8 years I realise how useless some skills are and how useless my skills have become. Maths/CFA/PHD etc are all included....the city is still all about who/what you know
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Kh
Khalid
26 March 2011
I am Dead with this Killer Question...The answer is A..I guess i have better question...geeks try it out.
Mr. X lives in a colony in which houses are numbered 1 to N in a straightline. The house of Mr. X is such that sum of house numbers on his left is equal to sum of house number on his right. If 100<N<300, then how many houses are there in the colony and what is the house number of Mr. X.
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