View source for Countif function

'''Countif function'''

Countif(range,criteria) counts the no of values in the specified range
which satisfies criteria. For example, countif(a2:a10,6) will give the
result how many times 6 occurs in the range a2 to a10.

example#2, =countif(d3:d20, "apples")will give the result how many times
apples occurs in the range d3 to a20.

example#3, =countif(f3:g3, a4)will give the result how many times the
value in a4 occurs in the row f3 to h3.

example#4, =countif(A1:A8,">=2") will give the result how many values
occur in the range a1 to a8 which are greater or equal to 2.