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Question

In a class of 25 students with roll numbers 1 to 25, only one student could answer a particular question. Find the probability that the roll number of that student is either the multiple of 5 or 7?

A 6/25 Correct Answer Incorrect Answer
B 4/25 Correct Answer Incorrect Answer
C 8/25 Correct Answer Incorrect Answer
D 7/25 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

A: Multiple of 5 and B: Multiple of 7 A = (5, 10, 15, 20, 25) B = (7, 14, 21). [if gte msEquation 12]>∴ [if !msEquation]--> [endif]-->P(A) = `5/25` [if gte msEquation 12]> 5 25 [if !msEquation]--> [endif]--> P (B)=`3/25` [if gte msEquation 12]> 3 25 [if !msEquation]--> [endif]--> [if gte msEquation 12]>∴ [if !msEquation]--> [endif]-->Required probability = P(A) + P(B) =`8/25` [if gte msEquation 12]> 8 25 [if !msEquation]--> [endif]-->

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