## Solution - Challenge 20 – Find Number of Friday the 13th between Two Given Dates

Below is a possible solution to the challenge - **Challenge 20 – Find Number of Friday the 13th between Two Given Dates**

The formula for finding this would be -

=SUMPRODUCT((TEXT(ROW(INDIRECT(A1&":"&A2)),"ddd")="Fri")*(TEXT(ROW(INDIRECT(A1&":"&A2)),"dd")="13"))