if a =-7.2, d=3.6 ,an = 7.2 find n^2
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a=-7.2
an=7.2
so n=-7.2÷7.2
so n=-1
now n2=-1×-1=1
an=7.2
so n=-7.2÷7.2
so n=-1
now n2=-1×-1=1
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