A) 7
B) 10
C) 8
D) 6
Correct Answer: C
Solution :
Let there are \[n\] candidates then \[^{n}{{C}_{1}}{{+}^{n}}{{C}_{2}}+......{{+}^{n}}{{C}_{n-1}}=254\]\[\Rightarrow \]\[{{2}^{n}}-2=254\] \[\Rightarrow \]\[{{2}^{n}}={{2}^{8}}\]\[\Rightarrow \]\[n=8\].
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