### Communities

tag:snake search within a tag
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
created:<1w created < 1 week ago
post_type:xxxx type of post
Q&A

# To correct for overcounting, why can't we divide by the sum of the over-counts? [duplicate]

+0
−1

Closed as duplicate by Peter Taylor‭ on Jan 24, 2022 at 08:52

This question has been addressed elsewhere. See: Why 1. multiply the number of independent options? 2. add the number of exclusive options?

This question was closed; new answers can no longer be added. Users with the reopen privilege may vote to reopen this question if it has been improved or closed incorrectly.

The book doesn't expatiate the sentence underlined in red below. 1. Why "it isn't 2 + 2"?

1. Note that $2 \times 2 = 2 + 2 = 4$! Is this a coincidence?

Problem 3.4: How many distinct arrangements are there of PAPA? David Patrick, BS Math & Computer Science, MS Math (Carnegie Mellon), PhD Math (MIT). Introduction to Counting & Probability (2005), p 50.

Why does this post require moderator attention?
Why should this post be closed? 