Question Number 167738 by HongKing last updated on 24/Mar/22
$$\mathrm{72}\:\:\:\rightarrow\:\:\:\mathrm{49} \\ $$$$\mathrm{42}\:\:\:\rightarrow\:\:\:\mathrm{16} \\ $$$$\mathrm{21}\:\:\:\rightarrow\:\:\:\mathrm{2} \\ $$$$\mathrm{16}\:\:\:\rightarrow\:\:\:? \\ $$
Answered by malwan last updated on 24/Mar/22
$$\mathrm{7}^{\mathrm{2}} =\mathrm{49} \\ $$$$\mathrm{4}^{\mathrm{2}} =\mathrm{16} \\ $$$$\mathrm{2}^{\mathrm{1}} =\mathrm{2} \\ $$$$\Rightarrow\mathrm{16}\equiv\mathrm{1}^{\mathrm{6}} =\mathrm{1} \\ $$
Answered by GalaxyBills last updated on 24/Mar/22
$$\mathrm{16}\rightarrow\mathrm{42} \\ $$