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counting and probability intermediate

Problem

Bertha has 6 daughters and no sons. Some of her daughters have 6 daughters, and the rest have none. Bertha has a total of 30 daughters and granddaughters, and no great-granddaughters. How many of Bertha's daughters and granddaughters have no daughters?
Solution
Bertha has granddaughters, none of whom have any daughters. The granddaughters are the children of of Bertha's daughters, so the number of women having no daughters is .
Final answer
26