Write a formula to check few cells have same value [homework]

Write a formula to check few cells have same value [homework]:
Lets test your Excel skills. Can you write a formula to check few cells are equal?

Your homework:

• Let us say you have four values in cells A1, A2, A3, A4
• Write a formula to check if all 4 cells have same value (ie A1=A2=A3=A4)
• Your output can be TRUE/FALSE or 1/0 to indicate a match (or mis-match)

Bonus question 1:
How would you write a formula if your values are in range A1:An
Bonus question 2:
What formula would work well if the cells contain non-numeric values (text, logical etc.)

Obvious answer:

The easiest and obvious answer is to test if all them are equal. The formula is,
=AND(A1=A2,A1=A3,A1=A4)
(select the above blank line to see answer)
But can you come up with some other options to test the equality?
Click here to post your answer.
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