For any natural number n, Prove that n∏r=1(r+1n)≤2(n!)
Trial Solution: Using 1n≤1,2,3,⋯n
n∏r=1(1+2n)≤2⋅4⋅6⋯⋯2n
n∏r=1(1+2n)≤2n⋅n!
Could some help me how to prove my original inequality, Thanks
Answer
We can verify directly for n=1,2. Suppose n≥3. Then
n∑r=1log(1+1rn)≤n∑r=11rn≤1+1/2+(n−2)/3n≤1118<log2.
Now exponentiate and multiply by n!.
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