A) \[11\]
B) \[21\]
C) \[55\]
D) \[66\]
Correct Answer: D
Solution :
Key Idea: The number of terms in the expansion of\[{{(a+b+c)}^{n}}\]\[^{n+2}{{C}_{2}}\]. The number of terms in the expansion of\[{{(a+b+c)}^{10}}\]is \[^{10+2}{{C}_{2}}{{=}^{12}}{{C}_{2}}\] \[=\frac{12\times 11}{2}=66\]
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