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F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

What is the solution of the equation? 35√(x+2)3+3=27