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A function f from integers to integers i...

A function `f` from integers to integers is defined as `f(x)={n+3, n in od d n/2,n in e v e n` suppose `k in ` odd and `f(f(f(k)))=27` . Then the sum of digits of `k` is__________

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RESONANCE DPP ENGLISH-JEE MAINS-All Questions
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