P is a set of four numbers 1, 2, 3 and 1. In every step, one is added to any two numbers in the set P. In how many such steps is it possible to make all the four numbers in the set P equal? Choose the correct choice from the following answers:	A) 4	B) 5	C) 6	D) 1	E) 2
If all the four numbers are equal, then their sum in the end of the process must be multiple of 4.   Now the sum of the given numbers is equal to 7. Each time we are adding 1 to two of any two numbers, so the sum increases by 2 each time. So the sum never becomes a multiple of 4 as odd + even = always odd.   4nswer:4
<result>A</result>
P is a set of four numbers 1, 2, 3 and 1. In every step, one is added to any two numbers in the set P. In how many such steps is it possible to make all the four numbers in the set P equal?