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Let f: N rarr N where N is set of natur...

Let `f: N rarr N ` where N is set of natural numbers be a function such that `f(x + y)=f(xy) AA x ge4 and y ge4`, then a)f(4) = f(5) b)f(8) = f(9) c)f(7) = f(8) d)f(5) = f(6)

A

f(4) = f(5)

B

f(8) = f(9)

C

f(7) = f(8)

D

f(5) = f(6)

Text Solution

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The correct Answer is:
B
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