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Barb is making a bead necklace she strings one white bead and then three blue beads then one White bead and so on write the numbers for the first eight beads that are white what is the rule for the pattern?
Using w to denotate white beads and b for blue beads, the pattern is wbbb wbbb wbbb...Then the beads that are white are the numbers 1, 5, 9 13, 17, 21, 25, 29,...The rule is the general term of an arithmetic progression with first term 1 and difference between contiguous terms equal to 4. An = Ao + d (n-1) = 1 + 4(n-1)
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