I feel like I am missing a step. I am unsure where how this equation arrived at 0.6.

An unfair coin has probability 0.4 of landing heads. The ooin is tossed four times. What is the probability that it lands heads at least once? Round the answer to four decimal places. Explanation The tosses of a coin are independent, since the outcome of a toss is not affected by the outcome of other tosses. The complement of landing heads at least once is landing tails all four times. We use the Rule of Complements to compute the probability. P(Lands heads at least once) = 1*P(Lands tails all four times) : 1*P(First toss is T and Second toss is T and Third toss is T and Fourth toss is T) : 1 -P(First toss is T) P(Second toss is T) P(Third toss is T) P(Fourth toss is T) : 1(10.4)4 : 140.6)\" = 170.1296 : 0.8704