how to do the 5th sum??
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60 =7+(n-1)d
60=7+(3n-3)
60=4+3n
60-4=3n
56=3n
n=56÷3
this is not possible 60 will not come in ap
60=7+(3n-3)
60=4+3n
60-4=3n
56=3n
n=56÷3
this is not possible 60 will not come in ap
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