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<html><body><h2 id="content-id-5938241760-2"><b>Probability Questions Overview</b></h2><p>Probability Questions have a good weightage in the Ssc Chsl Exam and the type of question asked in Ssc Chsl exam is similar to the question mentioned below. It has been solved and explained by KD Live Experts under the guidance of Neetu Mam and they have tried to elaborate the concept used in Probability Questions.</p><h2 id="content-id-6837590142-3"><b>Question On Probability </b></h2>Two prime numbers are selected from all the prime numbers below 40. Find the probability that their sum is even.
<div class="row show--dificulty--bar" style="margin-top:8px;"><div class="col-sm-6 show--dificulty--bar" style="display:inline-flex !important;border-right:0.1px solid #eee;"><h3 style="font-size:12px !important;">Difficulty : Moderate </h3></div><div class="col-sm-6 show--dificulty--bar" style="display:inline-flex;"><h3 style="font-size:12px !important;"> Average Time : 31 Seconds </h3></div></div><h2 id="content-id-8243670591-4"><b> Probability Questions Options</b></h2><ol><li><p>4/7</p>
</li><li><p>5/11</p>
</li><li><p>2/3</p>
</li><li><p>5/6</p>
</li><li><p>None of these</p>
</li></ol> <h2 id="content-id-5129438670-5"><b> Probability Questions Solution</b></h2><p>The correct answer is <strong>option 4</strong> i.e. <strong>5/6</strong></p>

<p>Prime numbers below 40 = 12 (2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37)</p>

<p>Sum of two numbers can only be even if both of them are odd or both are even.</p>

<p>Number of ways to select two prime numbers = <sup>12</sup>C<sub>2</sub> = 66</p>

<p>Probability of getting even sum = 1 - probability of getting odd sum</p>

<p>Number of ways to get odd sum = 11 (one number is 2 and other number from remaining 11 odd numbers)</p>

<p>Probability of getting odd sum = 11/66</p>

<p>Required probability = 1 - 11/66 = 5/6</p>
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The correct answer is option 4 i.e. 5/6 - Probability Questions are asked in Ssc Chsl exams and your question has been explained by experts like Neetu Mam.

Two prime numbers are sel - Probability Questions for Ssc Chsl

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