Cash flow can be different from net income because of several reasons:
1. The incomes statements are generally prepared on accrual basis. The actual flow of cash is different from the accrual. For example, some part of sales is on the basis of credit. Some purchases are made on credit. The other examples are interest accrued but not paid, insurance paid but not used, etc.
2. Net income ...
The solution describes several reasons why cash flows are different from net income.