Verified Answer :

apologiabiology

2,4,6
hmm, increases by 2
an=a1+d(n-1)
a1=first term
an=nth term
d=common differnece
increases by 2 and starts with 2

a1=2
d=2

an=2+2(n-1)
15th apartment/collumn
a15=2+2(15-1)
a15=2+2(14)
a15=2+28
a15=30


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