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  1. Given that 1² + 2² + 3² + ... + 20² = 2870, the value of (2² + 4² + 6² + ..... + 40²) is :
    1. 11480
    2. 5740
    3. 28700
    4. 2870
Correct Option: A

From the question ,
2² + 4² + 6² + .... + 40² = 2² (1² + 2² + 3² +.... + 20²)
Required answer = 4 × 2870 = 11480


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