Asked by dfvsz
A gardener is making a triangular planting, with 35 plants in the
front row, 31 in the second row, 27 in the third row, and so on. If
the pattern is consistent, how many plants will be there in the last
row? How many plants are there?
front row, 31 in the second row, 27 in the third row, and so on. If
the pattern is consistent, how many plants will be there in the last
row? How many plants are there?
Answers
Answered by
oobleck
row n has 35-4(n-1) = 39-4n plants
39 = 4*9+3, so the last row will have 3 plants
There are 10 rows, so
S10 = 10/2 (3*3 + 9*4)
39 = 4*9+3, so the last row will have 3 plants
There are 10 rows, so
S10 = 10/2 (3*3 + 9*4)
There are no AI answers yet. The ability to request AI answers is coming soon!