Question 88

Study the sequence of patterns in 1, 2 and 3 carefully. On the basis of these patterns, find the number of stars in pattern 9.

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Solution

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Pattern 1 has 4 stars, pattern 2 has 8 and pattern 3 has 12, so pattern $$n$$ has $$4n$$ stars. Pattern 9 therefore has $$4 \times 9 = 36$$ stars.

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