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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