Dongdong’s mother asked Dongdong to eat 1 egg or 1 duck egg every day, so how many ways can Dongdong eat the 4 eggs and 4 duck eggs at home?
冬冬妈妈每天让冬冬吃1个鸡蛋或者1个鸭蛋，那么冬冬吃完家里的4个鸡蛋和4个鸭蛋共有多少种吃法？
<gadget id="calculator">8 * 7 * 6 * 5</gadget>
<output>1_680</output>

<gadget id="calculator">4 * 3 * 2 * 1</gadget>
<output>24</output>

<gadget id="calculator">1_680 / 24</gadget>
<output>70</output>

<result>70</result>