On a stretch of urban freeway where the exits come thick and fast, one overhead sign lists three upcoming interchanges together with a distance beside each, and then you get no separate advance sign for the first of them. Has one been missed?

Correct answer: A. No — one interchange sequence sign replaces the advance signs for up to three closely spaced exits, and each ramp still gets its own turn-off sign

No — that combined sign is doing the job of all three. Book 8 says an interchange sequence sign "replaces the Advance Signs for up to three closely spaced interchanges", and is used "where the spacing of successive interchanges is insufficient to permit the installation of Advance Signs for each successive interchange." One such sign "effectively replaces all Advance Signs in the sequence and is located in advance of the first interchange." What you do still get is the sign at each ramp itself: "each crossing roadway in the sequence will have a separate Turn-Off Sign." The practical consequence is that on closely spaced exits your one chance to plan the lane change comes earlier than usual, all at once, so read the whole list rather than waiting for your own exit to be named again.

Source: MTO Driver's Handbook: Ontario Traffic Manual, Book 8 — Guide and Information Signs, Volume 1 (May 2010), Section 5.9 — Interchange Sequence Signs