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Verify that: (i) 15 C8 + 15 C9 - 15 C6 - 15 C7 = 0

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Verify that:

(i) 15 C8 + 15 C9 - 15 C6 - 15 C7 = 0

(ii) 10 C4 + 10 C3 = 11 C4

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