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*This function will not convert any numbers from text.
 
*This function will not convert any numbers from text.
 
*For e.g. "20" is normally converted as a number 20. But in ISNUMBER("20") will return FALSE, because "20" will not convert in to number.
 
*For e.g. "20" is normally converted as a number 20. But in ISNUMBER("20") will return FALSE, because "20" will not convert in to number.
  −
  −
1.ISBLANK(n)
  −
  n refers to an empty cell.
  −
2.ISERR(n)
  −
  n refers to any error value except #N/A.
  −
3.ISERROR(n)
  −
  n refers to any error value
  −
4.ISLOGICAL(n)
  −
  n refers to a logical value.
  −
5.ISNA(n)
  −
  n refers to the NaN error value.
  −
6.ISNONTEXT(n)
  −
  n refers to any item that is not text.
  −
7.ISNUMBER(n)
  −
  n refers to a number.
  −
8.ISREF(n)
  −
  n refers to a reference.
  −
9.ISTEXT(n)
  −
  n refers to text.
 
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