Given 1 + 2 + 3 + 4 + .... + 10 = 55, then the sum 6 + 12

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Given 1 + 2 + 3 + 4 + .... + 10 = 55, then the sum 6 + 12 + 18 + 24 + .... + 60 is equal to :

1. 300
2. 655
3. 330
4. 455

Correct Option: C

Given in question , 1 + 2 + 3 + 4 + .... + 10 = 55.
Then, 6 + 12 + 18 + 24 + .... + 60 = 6 (1 + 2 + 3 + 4 + .... + 10)
∴ Required answer = 6 × 55 = 330