Question

一个三位数,各位数字之和是6,有多少个?

Answer 1

楼上回答有误哈,忽略了0

6=3+3+0,330,303

=4+2+0,420,240,204,302

=4+1+1,411,141,114

=5+1+0,510,150,501,105,

=6+0+0,600

所以还有14个,一共应该21个