A) 0
B) 1242
C) 7315
D) 6345
E) 3340
Correct Answer: A
Solution :
\[^{20}{{C}_{4}}+{{2.}^{20}}{{C}_{3}}{{+}^{20}}{{C}_{2}}{{-}^{22}}{{C}_{18}}\] \[{{=}^{21}}{{C}_{4}}{{+}^{20}}{{C}_{3}}{{+}^{20}}{{C}_{2}}{{-}^{22}}{{C}_{18}}\] \[{{=}^{21}}{{C}_{4}}{{+}^{21}}{{C}_{3}}{{-}^{22}}{{C}_{18}}\] \[{{=}^{22}}{{C}_{4}}{{-}^{22}}{{C}_{18}}\] \[{{=}^{22}}{{C}_{18}}{{-}^{22}}{{C}_{18}}\] \[=0\]You need to login to perform this action.
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