I forgot to give the answers to the last set.
Here they are:
a. 34, 29, 24, 19, 14, 9
b. 0.5, 2, 4.5, 8, 12.5, 18 (it's my old friends, square numbers, but halved)
c. o, t, t, f, f, s (the first letters of English numbers One, Two, Three etc.)
Yep, sorry about that second one. Seems I've lost you by making them too hard, too quickly.
Here's one that stumped me for ages when I first saw it.
What are the next 2 in this sequence?
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