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If n is to be selected at random from set S, what is the probability

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If n is to be selected at random from set S, what is the probability  [#permalink]

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New post 19 Jan 2018, 11:00
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If n is to be selected at random from set S, what is the probability that n/5 - 4 <= 0?

(1) Every term in S is an integer between 4 and 16, inclusive.
(2) S is a set of 13 integers.

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Re: If n is to be selected at random from set S, what is the probability  [#permalink]

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New post 19 Jan 2018, 11:09
Bunuel wrote:
If n is to be selected at random from set S, what is the probability that n/5 - 4 <= 0?

(1) Every term in S is an integer between 4 and 16, inclusive.
(2) S is a set of 13 integers.


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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: If n is to be selected at random from set S, what is the probability  [#permalink]

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New post 20 Jan 2018, 23:20
Bunuel wrote:
If n is to be selected at random from set S, what is the probability that n/5 - 4 <= 0?

(1) Every term in S is an integer between 4 and 16, inclusive.
(2) S is a set of 13 integers.

n/5-4<=0 or, n<=20.

1) Since every term is between 4 & 16 i.e < 20, Probability of n<20 is 1. Sufficient.
2) We don't know which elements are <= 20 and which are >20. Hence insufficient.

Hence A.
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Re: If n is to be selected at random from set S, what is the probability &nbs [#permalink] 20 Jan 2018, 23:20
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