How to find largest sequence of a given number in excel?

Question

I have a column of zeros and ones

1
0
0
0
1
1

I want to find out the largest sequence of zeros I have in my column AND how many times it ap

Answer 1

With data in column A, in B1 enter:

=IF(A1=1,0,1)

and in B2 enter:

=IF(A2=0,1+B1,0)

and copy down:

the longest sequence is:

=MAX(B:B)

and the number of times it occurs is:

=COUNTIF(B:B,D1)

if the MAX() formula is in D1