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Let (a + bx + cx 2 ) 10 = ∑ = 20 10 i i i x p , a, b, c ∈ N. If p 1 = 20 and p 2 = 210, then 2(a + b + c) is equal to-

1. 6
2. 15
3. 12
4. 8

Correct answer: 12

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