the jamun tree - demo class

A tree Fern is

There are 15 trees in a row.4 trees are to be cut down.The number of ways that no two of the cut down trees are consecutive is.

A gardener has to plant trees in rows containing equal number of trees. If he plants in rows of 6, 8, 10 or 12, then five trees are left unplanted. But if he plants in rows of 13 trees each, then no tree is left. What is the number of trees that the gardener plants? (a) 485 (b) 725 (c) 845 (d) None of these