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The sum of all binomial coefficients ⁿC_0 + ⁿC_1 + … + ⁿC_n equals
An!
Bn + 1
Cn²
D2^n
Answer & Solution
Correct answer: D. 2^n
Substituting a = b = 1 in (a + b)^n gives 2^n = Σ ⁿC_r.
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