combobox relate to datatable

[er.viveksrivastava]

I have one combobox and one datatable. both are same page. now i want to relate to combobox to datatable. when i select first option of combobox then datatable row size is 5 and when i select second option of combobox then open 3 row in datatable.

[er.viveksrivastava]

Please anybody help me , send me solution of my question.