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What is the value of the integer p?

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What is the value of the integer p?  [#permalink]

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New post 29 Oct 2019, 21:50
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

70% (00:54) correct 30% (01:01) wrong based on 69 sessions

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Re: What is the value of the integer p?  [#permalink]

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New post 29 Oct 2019, 22:29
Bunuel wrote:
What is the value of the integer p?

(1) p is a prime number.
(2) 88 ≤ p ≤ 95


Statement I and II are clearly insuff..
Combined..
p can be 88, 89, 90, 91, 92, 93, 94, 95. In these numbers, 88, 90, 92, 94 are even, 91=13*7, 93=3*31, 95=19*5. Only 89 is left

C
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Re: What is the value of the integer p?  [#permalink]

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New post 30 Oct 2019, 01:24
What is the value of the integer p?

(1) p is a prime number.
p=2,3,5 etc- no unique value for p

A is insufficient


(2) 88 ≤ p ≤ 95

p=81,82,83 etc- no unique value for p
therefore B is insufficient

combining A and B
p= prime number between 88<p<95

p= 89

therefore C is the correct answer!!
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Re: What is the value of the integer p?  [#permalink]

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New post 19 Nov 2019, 11:07
in case you are having a difficulty in checking whether a number is prime or not you can follow this simple step:
calculate (n)^(1/2) and take its succeeding integral value = y,
for ex. n = 89
y = 10
now check only for numbers in range (2,y) including 2 and y,
if you find any factor then it is not a prime..

in this way you need not to check for all the numbers between 1 and 89


''hope you find this helpful"
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Re: What is the value of the integer p?   [#permalink] 19 Nov 2019, 11:07
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What is the value of the integer p?

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