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Mathematics 13 Online
OpenStudy (anonymous):

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OpenStudy (helder_edwin):

try replacing 1 2 3 4 in each of the four formulas. you have to get 7 10 13 and 16

OpenStudy (anonymous):

when n=1 ?= 7 n=2 ?=10 plug them into the equation then you'll know which sequence it is

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