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PSYCHO15rus [73]
3 years ago
5

A theatre has 50 seats on the front row. There are 4 additional seats in each following row.

Mathematics
1 answer:
alexandr402 [8]3 years ago
4 0
\boxed { \boxed { T_n = a_1 + d(n - 1)}}

\text {Given that }a_1 = 50 \text { and } d = 4

T_n = 50 + 4(n - 1)

T_n = 50 + 4n - 4

T_n = 46 + 4n

\boxed { \boxed {T_n = 46 + 4n }}

When n = 20,
T_{20} = 46 + 4(20) = 126

\boxed { \boxed {\text{Answer: The 20th term is 126}}}
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