21. If 8 points are marked on the circumference of a circle, how many chords can be obtained by joining them in pairs? a. 25 b. 27 c. 26 d. 28 22. A building contractor needs three helpers and ten men apply. In How many ways can these selections take place?
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To find the number of chords that can be obtained by joining 8 points on a circle, we can use the formula n(n-3)/2, where n is the number of points. So, in this case, we have n=8, which gives us: 8(8-3)/2 = 20 chords Therefore, the answer is 20. Show more…
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