Question Detail
Question
Prove by induction that 1 + 2 + 3 + ... + n = n(n+1)/2 for n≥1 and use it to find sum of first 50 integers.
Correct Answer
Option A is the correct answer.
Detailed Explanation
Use formula S_n = n(n+1)/2 → 50×51/2=1275.
Hint
Apply the proven formula.