Example 10 : In a flower bed, there are 23 rose plants in the first row, 21 in the
second, 19 in the third, and so on. There are 5 rose plants in the last row. How many
rows are there in the flower bed?
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2
Step-by-step explanation:
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Answer:
10 rows in flower bed
Step-by-step explanation:
a =23
d= -2
an= 5
an= a+(n-1) d
5= 23 + (n-1) *-2
-18/-2= n-1
9= n-1
n= 10
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