i have an easy question that i cannot solve it?
then what is the min of (1/x+1/y)
If X+Y=4, then X can be any of 0, 1, 2, 3 or 4, while at the same time, Y can be any of 4, 3, 2, 1 or 0; so that the sum X+Y is equal to 4.
0 is Invalid number, as any fraction with Zero as denominator is invalid or infinity. This makes 4 also an invalid choice.
From the other combination the least value for 1/X + 1/Y is obtained only with X & Y = 2.
Hence least value of 1/X + 1/Y = 1