Q:

A, B, C, D, E and F are cousins. No two cousins are of the same age. But everyone's birthday comes on the same date. The youngest is 17 years old and the eldest E is 22 years old. F is somewhere between B and D in age. A is older than B and C is older than D.

Which of the following statements is not possible -

• 1
  F's age is 18 years.
• 2
  F's age is 20 years.
• 3
  D's age is 20 years.
• 4
  F's age is 19 years.