A) \[{{2}^{20}}\]
B) \[{{2}^{20}}-1\]
C) \[{{2}^{20}}+1\]
D) \[{{2}^{21}}\]
Correct Answer: A
Solution :
\[^{21}{{C}_{0}}+....{{+}^{21}}{{C}_{10}}{{+}^{21}}{{C}_{1}}+......{{+}^{21}}{{C}_{0}}={{2}^{21}}\] \[{{(}^{21}}{{C}_{0}}+....{{+}^{21}}{{C}_{10}})={{2}^{20}}\]You need to login to perform this action.
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