alleryStart at2; alternate×2+a, then×3−b, with a,b each1–4. Exactly one other term is wrong:2,8,19,41,121,245. Its replacement?
A6
B8
C9
D7
Answer & Solution
Correct answer: D. 7
Only a=3,b=2 fits all but one term, giving2,7,19,41,121,245.
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