Q1. The following figure shows a part of a Microsoft Excel spreadsheet. Which of the following formulae cannot be used to add the given values 15,25 and 40?

              

	A
1	15
2	25
3	30
4

(1)  =SUM(A1..A3)

(2)  = SUM A1+ SUM A2+  SUM A3

(3)  = a1+a2+a3

(4)  =SUM(A1,A2,A3)