plz solve these 2 ds prob

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arghya05: Senior | Next Rank: 100 Posts; Posts: 81; Joined: Fri Apr 24, 2009 7:38 amFollowed by: 1 member; Thanked: 2 times

by arghya05 » Fri Jul 10, 2009 10:23 pm

What is the value of x?
(1) – (x + y) = x - y
(2) x + y = 2

The symbol ▽ represents one of the following operations: addition, subtraction, multiplication, or division. What is the value of 3 ▽ 2?
(1) 0▽1 = 1
(2) 1▽0 = 1

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Source: Beat The GMAT — Data Sufficiency | Fri Jul 10, 2009 10:23 pm

ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

Re: plz solve these 2 ds prob

by ketkoag » Sat Jul 11, 2009 12:57 am

arghya05 wrote:What is the value of x?
(1) – (x + y) = x - y
(2) x + y = 2

The symbol ▽ represents one of the following operations: addition, subtraction, multiplication, or division. What is the value of 3 ▽ 2?
(1) 0▽1 = 1
(2) 1▽0 = 1

for first question: A is the answer.. solve for x.. x=0. from 2 we don't know anything about y.

for second question : again A is the correct answer..
coz if u take statement 1 then only ADDITION will satisfy it..
0-1 = -1
0/1 = 0
0*1 = 0
0+1 = 1
so 3 +2 = 5
hence suff.

but if u take 2, then 1-0 = 0
and 1+0 = 0
so 3+2 = 5
or 3-2 = 1
hence insuff.

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nitya34: Master | Next Rank: 500 Posts; Posts: 179; Joined: Tue Jan 08, 2008 7:23 pm; Thanked: 11 times; GMAT Score:590

by nitya34 » Sat Jul 11, 2009 1:24 am

Easy Ones

Both A. as explained above.

Many of the great achievements of the world were accomplished by tired and discouraged men who kept on working.

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gmat740: MBA Student; Posts: 1194; Joined: Sat Aug 16, 2008 9:42 pmFollowed by: 17 members; Location: Paris, France; Thanked: 71 times; GMAT Score:710

by gmat740 » Sat Jul 11, 2009 3:07 am

but if u take 2, then 1-0 = 0
and 1+0 = 0
so 3+2 = 5
or 3-2 = 1
hence insuff.

for 2nd one:
IMO-D

1- 0 = 0(REALLY?

)

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nitya34: Master | Next Rank: 500 Posts; Posts: 179; Joined: Tue Jan 08, 2008 7:23 pm; Thanked: 11 times; GMAT Score:590

by nitya34 » Sat Jul 11, 2009 3:59 am

for the 2nd oneThe symbol ▽ represents one of the following operations: addition, subtraction, multiplication, or division. What is the value of 3 ▽ 2?
(1) 0▽1 = 1-->symbol will be +---SUFF
(2) 1▽0 = 1--->symbol could ve +,- hence UNSUFF

Many of the great achievements of the world were accomplished by tired and discouraged men who kept on working.

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