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Today, 20:04

The following list gives the coefficients for the binomial expansion of (x + y) 10. What is the value of B? 1, 10, 45, 120, 210, 252, 210, B, 45, 10, 1 A1 B10 C45 D120

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  1. Today, 20:16
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    The correct answer is D. 120
  2. Today, 20:23
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    1, 10, 45, 120, 210, 252, 210, B, 45, 10, 1

    Do you see how the coefficients are symmetrical?

    252 is in the center, the coefficients are combinatorial.

    C (1,10) C (2,10) C (3,10) ...

    B = 120
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