5. A theatre has 20 rows of seats. There are 15 seats in the first row, 17 in the second and each row has 2 more than the previous. a) Calculate the number of seats in the 20th row b) Calculate the total number of seats

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Chapter9: Sequences, Probability And Counting Theory
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5. A theatre has 20 rows of seats. There are 15 seats in the first row, 17 in the second and
each row has 2 more than the previous.
a) Calculate the number of seats in the 20th row
b) Calculate the total number of seats
Transcribed Image Text:5. A theatre has 20 rows of seats. There are 15 seats in the first row, 17 in the second and each row has 2 more than the previous. a) Calculate the number of seats in the 20th row b) Calculate the total number of seats
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