a3 = 13
a16 = 143
a16 = a3 + 13r
143 = 13 + 13r
13r = 143 - 13
13r = 130
r = 130/13
r = 10
QSL?
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Verified answer
a3 = 13
a16 = 143
a16 = a3 + 13r
143 = 13 + 13r
13r = 143 - 13
13r = 130
r = 130/13
r = 10
QSL?