Expand $(a + b)^{4}$.
A$a^{4} + 4a^{3}b + 6a^{2}b^{2} + 4ab^{3} + b^{4}$
B$a^{4} + 4ab + b^{4}$
C$a^{4} + b^{4}$
D$a^{4} + 2a^{2}b^{2} + b^{4}$
Answer & Solution
Correct answer: A. $a^{4} + 4a^{3}b + 6a^{2}b^{2} + 4ab^{3} + b^{4}$
Pascal row 4: $1, 4, 6, 4, 1$.
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