Question 19
The numbers 1, 2,3, 4,...,99, 100 are written on a whiteboard. Tom choose any
two numbers a and b, erases them and then writes down their sum a+b. He
continues the same process until one number is left on the whiteboard. What is
this number?
two numbers a and b, erases them and then writes down their sum a+b. He
continues the same process until one number is left on the whiteboard. What is
this number?