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If p = N + 5 when N is the product of an...

If `p = N + 5` when N is the product of any three consecutive postivie integer. Then :

A

pis prime

B

p is odd

C

p is divisible by 6

D

either of (b), (c)

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AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the expression given and evaluate the options based on the value of \( p \). ### Step-by-Step Solution: 1. **Understanding the Problem**: We are given that \( p = N + 5 \) where \( N \) is the product of any three consecutive positive integers. Let's denote these three consecutive integers as \( n, n+1, n+2 \). 2. **Finding the Product**: The product of three consecutive integers can be expressed as: \[ N = n(n + 1)(n + 2) \] 3. **Calculating \( p \)**: Substituting \( N \) into the equation for \( p \): \[ p = n(n + 1)(n + 2) + 5 \] 4. **Testing with Examples**: Let's take a few examples to see how \( p \) behaves. - **Example 1**: Let \( n = 4 \): \[ N = 4 \times 5 \times 6 = 120 \] \[ p = 120 + 5 = 125 \] - Check if \( p \) is prime: 125 is not prime (it is \( 5^3 \)). - Check if \( p \) is odd: 125 is odd. - Check if \( p \) is divisible by 6: 125 is not divisible by 6. - **Example 2**: Let \( n = 9 \): \[ N = 9 \times 10 \times 11 = 990 \] \[ p = 990 + 5 = 995 \] - Check if \( p \) is prime: 995 is not prime (it is \( 5 \times 199 \)). - Check if \( p \) is odd: 995 is odd. - Check if \( p \) is divisible by 6: 995 is not divisible by 6. 5. **Analyzing the Options**: Based on the examples: - \( p \) is not prime. - \( p \) is odd. - \( p \) is not divisible by 6. Since both examples consistently show that \( p \) is odd, we can conclude that the correct option is that \( p \) is odd. ### Conclusion: The correct answer is that \( p \) is odd.
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