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Because the individual tosses can have different outcomes, we're best off calculating the number of possible outcomes and then coming up with the number of desired outcomes by listing out the possibilities.
There are 2 possible outcomes for each toss, so after 4 tosses there are a total of 2 x 2 x 2 x 2 = 16 possible outcomes.
Let's list out all the possibilities where "at least 3 of the 4 tosses" come up heads:
H, H, H, T
H, H, T, H
H, T, H, H
T, H, H, H
H, H, H, H
So there are a total of 5 possible desired outcomes. Thus, the probability that at least 3 of the 4 tosses will come up heads is 
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Video Lessons and 10 Fully Explained Grand Tests
Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.