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प्रश्न
Select the correct answer from the given alternatives.
The value 11C2 + 11C4 + 11C6 + 11C8 is equal to
पर्याय
210 − 1
210 − 11
210 + 12
210 − 12
उत्तर
210 – 12
Explanation;
11C0 + 11C2 + ... + 11C8 + 11C10 = 211–1 = 210
∴ 11C2 + 11C4 + 11C6 + 11C8
= 210 – (11C0 + 11C10)
= 210 – (1 + 11)
= 210 – 12
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