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# How many prime integers are less than the integer x? (1)

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VP
Joined: 26 Apr 2004
Posts: 1225
Location: Taiwan
Followers: 2

Kudos [?]: 167 [0], given: 0

How many prime integers are less than the integer x? (1) [#permalink]  04 Sep 2004, 16:37
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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
How many prime integers are less than the integer x?

(1) 11<X<19

(2)17<=x<=29
Director
Joined: 20 Jul 2004
Posts: 593
Followers: 1

Kudos [?]: 48 [0], given: 0

E?

In all three cases - Stat(I), Stat(II), Both - the count is different when x=17 than when x=18.
Intern
Joined: 30 Aug 2004
Posts: 24
Followers: 0

Kudos [?]: 2 [0], given: 0

Mine is E too...different for 17,18
VP
Joined: 26 Apr 2004
Posts: 1225
Location: Taiwan
Followers: 2

Kudos [?]: 167 [0], given: 0

gmat800 wrote:
Mine is E too...different for 17,18

let me clarify it, combine (1) with (2)

the scope will be 17<=x<19

so, x might be 17 or 18

Therefore, the number of prime integers less than x will be different,

2,3,5,7,11,13,17 or 2,3,5,7,11,13

is it right?

thank you
Senior Manager
Joined: 16 Aug 2004
Posts: 327
Location: India
Followers: 1

Kudos [?]: 40 [0], given: 0

The question seeks to find prime number lesser than X.
It is therefore first to determine X.

I worked with the similar logic as yours and got E as the answer.
Because X can't be uniquely determined (as you showed, the number of primes vary with the 17 and 18). The answer is therefore E.
Manager
Joined: 18 Jun 2004
Posts: 105
Location: san jose , CA
Followers: 1

Kudos [?]: 29 [0], given: 0

my bad instead of looking X as integer i took x as prime too .

thanks folks , i know my mistake i agree with you folks its E.
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