Math miscellaneousHard

Question

The value of is equal to :

Options

A.7775
B.7785
C.7770
D.7780

Solution

Given = (r2 - r - 6) = (r2 - r - 6) -(r2 - r - 6)
= - 6(30 -15)
= 8215 - 345 - 90 = 7780

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