Question
If n is a positive integer greater than 1, then PRO(n) represents the product of all the prime numbers less than or equal to n. The largest prime factor of PRO(12)+11 is:
Answer: Option D
:
D
PRO (12)+11=2×3×5×7×11+11
=11×(2×3×5×7+1)
=11×(210+1)
=11×211
Since 211 is prime, the largest prime factor = 211.
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:
D
PRO (12)+11=2×3×5×7×11+11
=11×(2×3×5×7+1)
=11×(210+1)
=11×211
Since 211 is prime, the largest prime factor = 211.
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