Track / Stage 4 / 176 of 340 #436 of 2000

Problem 436

AMC 12 late, AIME early

Combinatorics Difficulty 4.9 Find the answer

4. Sophia stacks 7 round cards of different colors, one layer at a time from bottom to top, forming a flower. When Sophia stacks to the 5th card, which card is it?

A
B
C
D
E
$\mathrm{F}$
G

Your answer

Official solution

Translate the text above into English, please retain the original text's line breaks and format, and output the translation result directly.

Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.