The sum of (+3) and (+1) is +4.
When we add two positive numbers that have the same sign, we simply add their absolute values (ignoring the sign), and then place the common sign before the result. In this case, the absolute value of both numbers is 3 and 1, respectively. Adding 3 and 1 gives us 4. Since both numbers are positive, the sum is also positive. Therefore, we get the answer as +4.
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