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Q.

Suppose that fx is a linear function such that f0=0 and  f(1)=15. If n=1mf(n)n(n+1)(n+2)=114, then m is equal to ______.

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a

4

b

6

c

8

d

5

answer is D.

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Detailed Solution

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f(x+y)=f(x)+f(y)f(x)=kxf(1)=15k=15n=1mf(n)n(n+1)(n+2)=151m1(n+1)(n+2)=151m1n+11n+2=15121m+2=m10(m+2) Now m10(m+2)=11414m=10m+20m=5 

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