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## Answers

therefore, an = a+( n-1)d

or 80= -2+(n-1)2

or (n-1)2=80+2

or n-1=82÷2

or n=41+1

or n= 42

Also,

102= -2+(n-1)2

or (n-1)2=104

or n-1=52

or n=53

Hence,42,53

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therefore, an = a+( n-1)d

or 80= -2+(n-1)2

or (n-1)2=80+2

or n-1=82÷2

or n=41+1

or n= 42

Also,

102= -2+(n-1)2

or (n-1)2=104

or n-1=52

or n=53

Hence,42,53