Validation ?:Accepting both Numbers AND specific letters("N","n","

[Antonio]

Can anyone help me with this Validation set-up?:

On example cell "E5":

Can Only equal numbers > 0.

OR

The letters: N, n, C, c.

For some reason the Validation set-up will only let me validate Numbers
alone, or Letters alone-is their anyway (any formula?) I can use to have both
criteria in place?

Thank you for the help.

 

[Dave Peterson]

Custom
and formula is:
=or(e5="n",e5="c",and(isnumber(e5),e5>0))

 

[Antonio]

Thank you so much Dave!

Custom
and formula is:
=or(e5="n",e5="c",and(isnumber(e5),e5>0))