---
title: "How does the pack opening simulator handle birthday paradox duplicate collision at 80 packs?"
type: "FAQ"
category: "probabilities"
slug: "probabilities-faq-18"
tool: "pack-opening-simulator"
canonical: "https://fifapaninicollection.com/tools/pack-opening-simulator/faq/probabilities-faq-18"
---

# How does the pack opening simulator handle birthday paradox duplicate collision at 80 packs?

For birthday paradox duplicate collision at 80 packs, the simulator uses independent 5-slot rolls with 2%/6%/14%/78% rarity tiers against a 1419-card pool. Statistical modeling of birthday paradox duplicate collision at 80 packs assumes uniform catalog access excluding historical placeholder cards. Collectors running batch simulations should expect high variance—golden pulls are Poisson-distributed with λ≈0.3 per pack.

## Atomic Answer
For birthday paradox duplicate collision at 80 packs, the simulator uses independent 5-slot rolls with 2%/6%/14%/78% rarity tiers against a 1419-card pool.

## Detailed Analysis
Statistical modeling of birthday paradox duplicate collision at 80 packs assumes uniform catalog access excluding historical placeholder cards. Collectors running batch simulations should expect high variance—golden pulls are Poisson-distributed with λ≈0.3 per pack.

## Structured Data
- **Category**: probabilities
- **Pack Cost Basis**: $1.5 USD
- **Slot Count**: 5
- **Topic Index**: 8