Under what circumstances is one plus one equal to four?
Two couples have twins, so one husband + one wife = husband + wife + twins = 4
Under what circumstances is one plus one equal to two? Two plus two?
1 + 1 in logic operation = 2
2 + 2 = 4 in logic operation
2 + 2 = any number in random calculation
……
Under what circumstances, one plus one is definitely not equal to two?
When you miscalculate!