PS Recursive functions question

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ern5231: Master | Next Rank: 500 Posts; Posts: 226; Joined: Sun Aug 09, 2009 4:34 am

by ern5231 » Mon Aug 10, 2009 2:45 pm

Formula : A(n)=c*A(n-1)
Given : A8=-1/8 A7=1/4
Calculate : A1 = ?

Source: Beat The GMAT — Problem Solving | Mon Aug 10, 2009 2:45 pm

ghacker: Master | Next Rank: 500 Posts; Posts: 148; Joined: Wed Jun 03, 2009 8:04 pm; Thanked: 18 times; Followed by:1 members

by ghacker » Mon Aug 10, 2009 4:09 pm

A8 and A7 are given to calculate C C is actually half and we see that A7 is twice that of A8

So A1 is 2^7 time the value of A8 ;A1 = 16

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