Answer:
1097
Explanation:
Common Difference:
d=a_2-a_1=(31)-(18)=13
d=a
2
−a
1
=(31)−(18)=13
a_n=a_1+(n-1)d
a
n
=a
+(n−1)d
\text{84th term:}
84th term:
a_{84}=18 + (84-1)(13)
84
=18+(84−1)(13)
a_{84}=18 + (83)(13)
=18+(83)(13) a_{84}=1097 a 84
=1097
common difference = 31-18
common difference =13
from,
An=A1 +(n-1)d
A84=18+(84-1)13
A84=1097
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