Enrich · Mathematics Extension 1 11–12 – Year 11 · The binomial theorem
Enrich Use patterns and symmetry in Pascal’s triangle to confirm the identities ⁿC_r = ^(n - 1)C_r - 1 + ^(n - 1)C_r for 1 ≤ r ≤ n - 1 and ⁿC_r = ⁿC_n - r for 0 ≤ r ≤ n
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