2 . The number of seats in a theatre is investigated . The number of seats in the first row of the theatre u
1 is 100 . The number of seats in each subsequent row forms an arithmetic sequence . The number of seats in the tenth row u
10 is 181 .
( a ) |
Find the value of d , the common difference . |
( b ) |
Hence , write down the number of seats in the thirteenth row . |
There are 15 rows in the theatre . |
( c ) |
Find the total number of seats in the theatre . |
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