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OpenStudy (anonymous):
how do you do this question d=1/2n(n-3) find d if n=20
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OpenStudy (anonymous):
just substitute the value of n to the equation, then you will find the value of d
OpenStudy (anonymous):
have you tried this out a bit ?
OpenStudy (anonymous):
\[d=1/2n (n-3); if n=20\]\[d=1/2(20) (20-3)\]\[d=(10)(17)\]\[d=170\]
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