79231859

Date: 2024-11-27 20:58:20
Score: 1.5
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This solution uses the formula of the questioner Statto of this discussion: Restarting and resuming a running total for multiple values

One formula for scenarios with and without blanks:

=SUM(N(MAP(A2:A11,LAMBDA(a,COUNTIFS(INDEX(A2:A11,1):a,a)))>1)) 

=SUM(N(MAP(B2:B14,LAMBDA(a,COUNTIFS(INDEX(B2:B14,1):a,a)))>1))

letter

letters

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Posted by: user22566114