Explanation:

Sol. Ans.(a).

Given statements are – first, all numbers are divisible by 2 and second, all numbers are divisible by 3. If a number is divisible by 3 and 2 then it will surely be divisible by 6 (which is 2 x 3), but will not be necessarily divided by 4.

For example – 6, 18, 30 … are all such numbers. Hence only conclusion 1 is true (logically follows).