1² + 2² + 3² + ................... + 50² = ?

প্রশ্ন: 1² + 2² + 3² + ................... + 50² = ?

সমাধান:
1² + 2² + 3² + 4² + ......+n² = n(n + 1)(2n + 1)/6
1² + 2² + 3² + ..................+ 50² = 50(50 + 1)(2 × 50 + 1)/6
= (50 × 51 × 101)/6
= 42925