Solution
$$ 3^{50} = 243^{10} $$
$$4^{40} = 1024^{10}$$
$$5^{30} = 125^{10}$$
$$6^{20} = 36^{10}$$
So, the greatest would be $$4^{40}$$.
So , the answer would be option a)$$4^{40}$$.
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