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In following number series, two terms have been put within brackets. Choose the appropriate option - Choose correct alternative that will same pattern and fill in the blank spaces. 7, 6, 10 ,27, 104, __

Answer: C. 515

Here,

7 * 1 - 1 = 6

6 * 2 - 2 = 10

10 * 3 - 3 = 27

27 * 4 - 4 = 104

So 104 * 5 - 5 = 515

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