Solve for η
\eta =21
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\eta ≔21
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\eta =\frac{5040}{2!\times 5!}
The factorial of 7 is 5040.
\eta =\frac{5040}{2\times 5!}
The factorial of 2 is 2.
\eta =\frac{5040}{2\times 120}
The factorial of 5 is 120.
\eta =\frac{5040}{240}
Multiply 2 and 120 to get 240.
\eta =21
Divide 5040 by 240 to get 21.
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