I am a bit confused about this problem.

Coin W is tossed once, and coin X is tossed twice. Both coins are fair.

Quantity A

The probability that coin W returns heads and coin X returns tails twice

Quantity B

0.125

If only one case is considered eg, WXX is considered then the probability is 0.125 or 1/8

Why do we not consider XWX or XXW?

If all 3 cases were considered then won’t the probability be 3/8?

How can I figure out when they want different kinds of tosses and when it’s specific to a single case?