A variable is a placeholder for an unknown value
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The value of equation when n = 3 is 50
<em><u>Solution:</u></em>
<em><u>Given equation is:</u></em>
We have to find the value of equation when n = 3
By plugging in n = 3 in given equation we can find the value of given equation
<em><u>Substitute n = 3 in given equation</u></em>
Thus the value of equation when n = 3 is 50