Are you sure that's exactly the way it is in the calculation? The syntax looks correct to me.
That was copied from the ebook into the calculations and from the calculations to the question. Thanks JT
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Copying and pasting from PDF will introduce a LOT of unwanted invisible characters that cause problems. If you inspect the pasted text in a text editor you'll find the culprit. The best thing is to type the calc yourself.
that worked thanks