从1,2,3,4,5,6,7,8,9这9个连续自然数中，任取两个数（1）积是奇数的取法有多少（2）和是偶数的取法有几种
推荐回答（3个）
积是奇数的取法有10种→1×3. 1×5. 1×7. 1×9. 3×5. 3×7. 3×9. 5×7. 5×9. 7×9.
和是偶数的取法有16种 →1+3. 1+5. 1+7. 1+9. 2+4. 2+6. 2+8. 3+5. 3+7. 3+9. 4+8. 4+6. 5+7. 5+9. 6+8. 7+9.
出题者请不要误会我写少了 、题目中说了‘任取两个数’所以不能取同样数字
(1)奇数相乘为奇1 3、1 5 、1 7、1 9、3 5、3 7、3 9、5 7、5 9、7 9。共10种
(2)奇数加奇数，偶数加偶数2 4、2 6、2 8、4 6、4 8、6 8。加上(1)的10种，共16种。
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