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a. The number of times the keyword is used in the page / (divided by) the total word count on page - (minus) the total words in HTML on the page b. The number of times the keyword is used in the page x (multiply by) the total word count on page. c. The number of times the keyword is used in the page x (multiply by )100 / (divided by) the total word count on page. d. The number of times the keyword is used in the page description e. The number of times the keyword is used in the page title f. The number of times the keyword is used in the page / (divided by) the total word count on the page.
c. The number of times the keyword is used in the page x (multiply by )100 / (divided by) the total word count on page. The Keyword density is expressed as a percentage.
First I select (f) than I suppose you have a keyword "search engine optimization" and article body contains500 word and the keyword is used3 times in your body.
Keyword Density could be found by this:
Word count in keyword * Keyword used in body / total word count in body *100 = Your answer