How many numbers from 11 to 5 are there which are exactly divisible by 7 but not by 3 ?
Answer: B. Four
The numbers from 11 to 50, which are divisible by 7 are 14, 21, 28, 35, 42, 49. But out of three, 21 and 42 are divisible by 3. .'. The required numbers are 14, 28, 35, 49. Clearly, there are four such numbers.