function

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billyr: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Tue Dec 16, 2008 11:53 pm

by billyr » Mon Feb 23, 2009 8:15 am

For which the functions f is f(x)=f(x-1) for all x?

a)f(x)=1-x

b)f(x)=1-x^2

c)f(x)=x^2 (1-x^2)^2

d)f(x)=x^2+1

The answer is c

thanks

please help me if possible with explanation.

Last edited by billyr on Mon Feb 23, 2009 8:44 am, edited 1 time in total.

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Source: Beat The GMAT — Problem Solving | Mon Feb 23, 2009 8:15 am

x2suresh: Master | Next Rank: 500 Posts; Posts: 258; Joined: Thu Aug 07, 2008 5:32 am; Thanked: 16 times

Re: function

by x2suresh » Mon Feb 23, 2009 8:30 am

billyr wrote:For which the functions f is f(x)=f(x-1) for all x?

a)f(x)=1-x

b)f(x)=1-x^2

c)f(x)=x^2 (1-x^2)

d)f(x)=x^2+1

The answer is c

thanks

thats not possible.. I believe there is type in option c

Answer would be C only if option : x^2 (1-x)^2

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