Find the average of squares of consecutive even numbers from 1 to 20?1 से 20 तक की क्रमागत सम संख्याओं के वर्गों का औसत पता लगाइये।

1. A154
2. B151
3. C155
4. D153

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Correct answer: A. 154

Explanation

Even numbers 2, 4, …, 20 (10 numbers). Sum of squares = 4(1² + … + 10²) = 4 × 385 = 1540. Average = 1540 ÷ 10 = 154.सम संख्याएँ 2, 4, …, 20 (10 संख्याएँ)। वर्गों का योग = 4(1² + … + 10²) = 4 × 385 = 1540। औसत = 1540 ÷ 10 = 154।