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Sushant Kumar · Answer

answer is d as f(x)=kx f(1)=7=kx hence k=7 f(x)=7x summation f(x)=7n(n+1)/2 hope this will help tip: whenever the function is like f(x+y)=f(x)+f(y) it is always kx and we find k by using the conditions given in the question

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Please answer the question from Function.......... .............:.:.:.:..:.:.:.:.:.:..:.:.:.:.:

Please answer the question from Function..........
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