What is the smallest number of lobsters in a tank if I lobst

What is the smallest number of lobsters in a tank if I lobster is left over when they are removed 2, 3. 5 or 7 at a time but no lobsters are left over when they removed 11 at a time

Solution

The minimum number of lobsters will be 2 * 3 * 5 * 7 + 1 = 211 lobsters

Reason: Since 2,3,5 and 7 are all prime numbers, hence we need to multiply all the numbers and add 1 to leave remainder of 1