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:
none of these
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.