Question Detail
Question
If P(n) is the statement 1+2+...+n = n(n+1)/2, what is P(1)?
Correct Answer
Option A is the correct answer.
Detailed Explanation
P(1) means substitute n=1 into the statement: 1 = 1(1+1)/2 = 1×2/2 = 1. So the statement becomes 1 = 1, which is true.
Hint
Substitute n=1 into the given formula.