. Evaluate the following pairs of combinations and compare their values
a) 11C2, 11C9
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Answer:
☞11c2 = 11×10/2 = 55
☞11C9 = 11×10×9×8×7×6×5×4×3 ÷ 9×8×7×6×5×4×3×2
= 55
☞ because ncr = ncn-r
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