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The sum of the series <br> $^{20}C_0 - ^{20}C_1 + ^{20}C_2 - ^{20}C_3 + . . . .- . . . . + ^{20}C_{10}$ is :


( A ) $^{20}C_{10}$
( B ) $0$
( C ) $\frac{1}{2} ^{20}C_{10}$
( D ) $-^{20}C_{10}$

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