18n + 31 find common difference
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0
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24
Answer:
let n = 1 ; 2 ; 3
18n + 31 = 18 + 31 = 49
18n + 31 = 36 + 31 = 67
18n + 31 = 54 + 31 = 85
d = a(2) - a(1) =a(3) - a(2)
= 67 - 49 = 85 - 67
= 18 = 18
d = 18
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