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If n is a positive integer and m = 6.25 × 10^n, what is the value of n

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If n is a positive integer and m = 6.25 × 10^n, what is the value of n  [#permalink]

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New post 01 Sep 2016, 02:51
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

75% (01:07) correct 25% (01:31) wrong based on 128 sessions

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Re: If n is a positive integer and m = 6.25 × 10^n, what is the value of n  [#permalink]

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New post 01 Sep 2016, 07:54
If n is a positive integer, n can have values: 1,2,3,4 and so on.
So m can be 6.25, 62.5, 625, 6250 and so on.

Statement 1:
500 < m < 5,000
m can only be 625. So n will be 3.

Sufficient!

Statement 2:
m < 6,250
So, m can only be 6.25, 62.5 or 625. So n can be 1,2 or 3.

Insufficient!

Hence, the answer will be A.
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If n is a positive integer and m = 6.25 × 10^n, what is the value of n  [#permalink]

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New post Updated on: 09 Mar 2017, 22:55
14101992 wrote:
If n is a positive integer, n can have values: 1,2,3,4 and so on.
So m can be 6.25, 62.5, 625, 6250 and so on.

Statement 1:
500 < m < 5,000
m can only be 625. So n will be 3.

Sufficient!

Statement 2:
m < 6,250
So, m can only be 6.25, 62.5 or 625. So n can be 1,2 or 3.

Insufficient!

Hence, the answer will be A.


Your Option is right but the value of n will be 2 not 3.

Posted from my mobile device

Originally posted by awdxzs on 09 Mar 2017, 22:52.
Last edited by awdxzs on 09 Mar 2017, 22:55, edited 1 time in total.
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Re: If n is a positive integer and m = 6.25 × 10^n, what is the value of n  [#permalink]

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New post 09 Mar 2017, 22:54
14101992 wrote:
If n is a positive integer, n can have values: 1,2,3,4 and so on.
So m can be 6.25, 62.5, 625, 6250 and so on.

Statement 1:
500 < m < 5,000
m can only be 625. So n will be 3.

Sufficient!

Statement 2:
m < 6,250
So, m can only be 6.25, 62.5 or 625. So n can be 1,2 or 3.

Insufficient!

Hence, the answer will be A.


Your Option is right but the value of n will be 2 not 3.

Posted from my mobile device

Posted from my mobile device
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Re: If n is a positive integer and m = 6.25 × 10^n, what is the value of n  [#permalink]

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New post 10 Mar 2017, 00:31
m = 6.25 x 10^n
St 1: 500<m<5000. for n=1, m=62.5; for n=2, m=625 and for n=3, m=6250. the condition holds true only for n=2. ANSWER

St 2: m<6250. for this condition to hold true n will be 1,2. INSUFFICIENT

Option A
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Re: If n is a positive integer and m = 6.25 × 10^n, what is the value of n  [#permalink]

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New post 13 Oct 2017, 19:30
2
1
Statement 2:
If m < 6,250 then n can be 1, 2, 3. Insufficient

Statement 1:
For this type of statement, it will be difficult if you try to divide both sides of the inequality by the same number. Instead, you can try replacing n with different values, beginning from 1 (as n is a positive integer). The only value of n satisfied here is 2. Sufficient


=> A
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Re: If n is a positive integer and m = 6.25 × 10^n, what is the value of n &nbs [#permalink] 13 Oct 2017, 19:30
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