The first five numbers in Patterns A and B are given. Pattern A: \( 5,7,10,14,19, \ldots \) Pattern B: 4, \( 8,12,16,20, \ldots \) What is the first number that is in both Pattern A and Pattern B? Enter the number in the box.
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The Deep Dive
To find the first number that appears in both Pattern A and Pattern B, we first need to determine the formulas for each pattern. For Pattern A: - The differences between the numbers are: \( 2, 3, 4, 5, \ldots \) This indicates that each term is generated by adding consecutive natural numbers to the previous number. The nth term can be expressed as: \[ a_n = 5 + \frac{(n-1)n}{2} \] (This is derived from adding 2, 3, 4,... up to \( n \)). For the first few terms, we can calculate: - \( a_1 = 5 \) - \( a_2 = 7 \) - \( a_3 = 10 \) - \( a_4 = 14 \) - \( a_5 = 19 \) - \( a_6 = 25 \) - \( a_7 = 32 \) For Pattern B: This is an arithmetic sequence where: - First term = 4 - Common difference = 4 Thus, the nth term is: \[ b_n = 4 + 4(n - 1) = 4n \] Calculating the first few terms: - \( b_1 = 4 \) - \( b_2 = 8 \) - \( b_3 = 12 \) - \( b_4 = 16 \) - \( b_5 = 20 \) - \( b_6 = 24 \) - \( b_7 = 28 \) - \( b_8 = 32 \) Now we check for common numbers: - The possible numbers in Pattern A: \( 5, 7, 10, 14, 19, 25, 32, \ldots \) - The possible numbers in Pattern B: \( 4, 8, 12, 16, 20, 24, 28, 32, \ldots \) The first common number is **32**.