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If n is a positive integer, which of the following statements are correct?
  1. All the prime numbers greater than 3 can be represented in the form 4n +1 or 4n + 3
  2. All numbers of the form 4n + 1 and 4n + 3 are prime numbers
  3. All the prime numbers greater than 3 can be represented in the form 6n – 1 or 6n + 1 
  • a)
    1st statement only
  • b)
    2nd statement only
  • c)
    3rd statement only
  • d)
    1st and 2nd statements
  • e)
    1st and 3rd statements
Correct answer is option 'E'. Can you explain this answer?
Verified Answer
If n is a positive integer, which of the following statements are corr...
Step 1: Question statement and Inferences
Let us list the prime numbers less than 50:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47 . . .
Step 2: Finding required values 
Let’s now evaluate the two forms given and then evaluate which of these is able to describe the list above.
Option A: The form 4n + 1 and 4n + 3
As we see, all the prime numbers greater than 3 can be represented in the form 4n+1 or 4n+3.
Therefore, Statement I is correct.
However, we also see in the table that not every number of the form 4n + 1 and 4n + 3 is a prime number.
Therefore, Statement II is not correct.
Option B: The form 6n – 1 and 6n + 1
As we see, all the prime numbers greater than 3 can be represented in the form 6n+1 or 6n-1.
Therefore, Statement III is correct.
 
Step 3: Calculating the final answer
Looking at the answer choices, we see that Option E is correct.
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Most Upvoted Answer
If n is a positive integer, which of the following statements are corr...
Step 1: Question statement and Inferences
Let us list the prime numbers less than 50:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47 . . .
Step 2: Finding required values 
Let’s now evaluate the two forms given and then evaluate which of these is able to describe the list above.
Option A: The form 4n + 1 and 4n + 3
As we see, all the prime numbers greater than 3 can be represented in the form 4n+1 or 4n+3.
Therefore, Statement I is correct.
However, we also see in the table that not every number of the form 4n + 1 and 4n + 3 is a prime number.
Therefore, Statement II is not correct.
Option B: The form 6n – 1 and 6n + 1
As we see, all the prime numbers greater than 3 can be represented in the form 6n+1 or 6n-1.
Therefore, Statement III is correct.
 
Step 3: Calculating the final answer
Looking at the answer choices, we see that Option E is correct.
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If n is a positive integer, which of the following statements are correct? All the prime numbers greater than 3 can be represented in the form 4n +1 or 4n + 3 All numbers of the form 4n + 1 and 4n + 3 are prime numbers All the prime numbers greater than 3 can be represented in the form 6n – 1 or 6n + 1a)1st statement onlyb)2nd statement onlyc)3rd statement onlyd)1st and 2nd statementse)1st and 3rd statementsCorrect answer is option 'E'. Can you explain this answer?
Question Description
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