each of the intergers from0-9, inclusive, in written on a separate slip of XX paper and the ten slips are dropped into a hat. ********* How many must be drawn to ensure that the numbers on two of the slips drawn will have a sum of 10?
【机委】7
R:最坏的可能是写有 0---5的放入帽子中,共6ships, 6+1-=7.
最少放 7ships才能保证有5+6=11〉10
///////这刀题是什么意思/??看不明白
[em19][em19]