Insert 1,2,3 into A and rand() values into B Hide row 2 (or resize) => rand() is recalculated I expect rand() to not change on sheet and format changes.
Why not? Any rand is as good as another ;-) I didn't investigate deeply but background probably is that hiding rows/columns may affect SUBTOTAL() and AGGREGATE() and dirty formulas are recalculated (of which in this example there are none explicitly, but..), including all volatile functions like RAND(). Also, changing the view may display cells previously undisplayed and not yet calculated, so some recalculation has to happen. Given that LO 7 will have non-volatile RAND.NV() and RANDBETWEEN.NV() I don't consider this issue important enough to disentangle the volatile/subtotal logic for these; however, doing so (not recalculating all volatile when sizing/hiding/showing columns or rows) might save some recalculation cycles on larger documents using also other volatile functions like OFFSET() or INDIRECT() or others. So might be worth investigating.
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Let's resolve NAB as rand.nv() does the trick.