My mother exchanged 20 consecutive numbers of 5 yuan from the bank. Lin Lin wanted to take out 6 consecutive numbers. How many different ways does he have?
妈妈从银行里兑换了20张连号的5元人民币，林林想从中取出6张连号的，他一共有多少种不同的取法．
<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<gadget id="calculator">14 + 1</gadget>
<output>15</output>

<result>15</result>