A) \[{{2}^{9}}\]
B) \[{{9}^{2}}\]
C) \[{{3}^{2}}\]
D) \[{{2}^{9-1}}\]
Correct Answer: A
Solution :
\[49{{[}^{n}}{{C}_{2}}{{+}^{n}}{{C}_{3}}(7)+......{{+}^{n}}{{C}_{n}}{{7}^{n-2}}]\]; \[B=\{2,\,3,\,5\}\] \ A ´ B contains \[3\times 3=9\] elements. Hence, number of relations from A to B \[={{2}^{9}}\].
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