If p is a prime number and P is the product of all prime numbers less than or equal to p then :
P + 1 is not a prime number
P + 1 is a composite number
P - 1 is a prime number
none of these
If you take 7 as prime number. 7X5X3X2 = 210. 210 - 1 = 209 209 is divisible by 19. This answer does not hold good for 7?