how many positive integers can be expressed as a product of two or more of the prime numbers 5,7,11 and 13 if no one of the product should include the same prime factor more than once...
actually i multiplied 5*7*11*13 and got 5005 so i thought the answer will be like all multiples of 5005 but the answer was 11 .so can any one tell me the solution for this question