an=a1+(n-1)r
a16=a1+15r
53=a1+15*4
53=a1+60
53-60=a1
a1=-7
an=a1+(n-1)r>>
a16=a1+(16-1)4>>
53=a1+15.4>>
a16-15.r=a1
53-60= -7
a1= -7
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Verified answer
an=a1+(n-1)r
a16=a1+15r
53=a1+15*4
53=a1+60
53-60=a1
a1=-7
an=a1+(n-1)r>>
a16=a1+(16-1)4>>
53=a1+15.4>>
a1=-7
a16-15.r=a1
53-60= -7
a1= -7