Answer:
2
Step-by-step explanation:
1+1 is a mathematical expression that evaluates to:
2 (number) (in ordinary arithmetic)
1 (number) (in Boolean algebra with a notation where '+' denotes a logical disjunction)
0 (number) (in Boolean algebra with a notation where '+' denotes 'exclusive or' operation, or in a quotient ring of numbers modulo 2)