Agroup consists of seven men and eight women. seven people are selected to attend a conference. a. in how many ways can seven people be selected from this group of fifteen?

Need on this one asap im almost done with this subject

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Plz.yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?