M= 4^1/2+ 4^1/3+4^1/4
= 2+2^2/3+2^1/2
We know that 2^1/2 is 1.414 (approx)
Hence 2+2^2/3+1.414 = 3.414+2^2/3
2^2/3 will definitely be greater than 1.414 hence M>4
Thanks,
Quants-Master
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RedeemM= 4^1/2+ 4^1/3+4^1/4