13+23+33+...............+103=কত?
Solution
Correct Answer: Option A
আমরা জানি
13+23+33+...............+103 = {n(n + 1)/2}2
13+23+33+...............+103 = {10(10 + 1)/2}2
= (5 × 11)2
= (55)2
= 3025
13+23+33+...............+103 = {n(n + 1)/2}2
13+23+33+...............+103 = {10(10 + 1)/2}2
= (5 × 11)2
= (55)2
= 3025
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