Step-by-step explanation:
7,_,_,_15
15=7+(5-1)d
8=4d
d=2
a2=7(2-1)2
a2=7+2
a2=9
a3=11
a4=13
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Step-by-step explanation:
7,_,_,_15
15=7+(5-1)d
8=4d
d=2
a2=7(2-1)2
a2=7+2
a2=9
a3=11
a4=13