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Preview questions
1. What is the general term in the expansion of (a + b)^n?
nCk * a^(n-k) * b^k · nCk * a^k * b^(n-k) · nCk * a^(n+k) * b^k · nCk * a^(k) * b^(n-k)
2. In the expansion of (x + y)^5, what is the coefficient of x^3y^2?
10 · 15 · 5 · 20
3. The value of (1 + x)^n for n = 0 is:
1 · n · 0 · x
4. What is the sum of the coefficients in the expansion of (x + 1)^4?
4 · 8 · 16 · 5
5. Which of the following represents the number of terms in the expansion of (a + b)^n?
n + 1 · n · 2n · n^2
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