BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Sequence

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 221
Joined: Mon Dec 22, 2008 6:24 pm
Thanked: 2 times

Sequence

by mgmt_gmat » Fri Feb 12, 2010 2:35 am
In the sequence of nonzero numbers t1, t2, t3, ..., tn, ..., tn+1 = tn / 2 for all positive integers
n. What is the value of t5?
(1) t3 = 1/4
(2) t1 - t5 = 15/16
Top
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1275
Joined: Thu Sep 21, 2006 11:13 pm
Location: Arabian Sea
Thanked: 125 times
Followed by:2 members

by ajith » Fri Feb 12, 2010 6:53 am
mgmt_gmat wrote:In the sequence of nonzero numbers t1, t2, t3, ..., tn, ..., tn+1 = tn / 2 for all positive integers
n. What is the value of t5?
(1) t3 = 1/4
(2) t1 - t5 = 15/16
1.) t3 = 1/4

t4 = t3/2 = 1/8
t5 = t4/2 = 1/16

Sufficient

2) t2 = t1/2
t3 = t2/2 = t1/4
t4 = t3/2 = t1/8
t5 = t4/2 = t1/16

t1 - t5 = t1 -t1/16 = 15/16 t1 = 15/16 => t1 =1
t5 = t1/16 = 1/16

Sufficient

D
Always borrow money from a pessimist, he doesn't expect to be paid back.
Top
Post new topic Post Reply
• Page 1 of 1