How many binary relations are there on a set S with 9 distinct element

1.	How many binary relations are there on a set S with 9 distinct elements?
A.	2⁹⁰
B.	2¹⁰⁰
C.	2⁸¹
D.	2⁶⁰
Answer» D. 2⁶⁰

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How many binary relations are there on a set S with 9 distinct elements?

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