Mang Teban is making a triangular planting with 30 seedlings in the front row, 26 in the 2nd row, 22 in the 3rd row and so on. How many plants are there in the first row?
use arithmetic sequence and series
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ARITHMETIC SEQUENCE AND SERIES
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> There are 30 plant in the first row
✨✨✨✨✨✨✨✨✨✨✨✨✨
EXPLANATION:
a2 - 2b. a3=22
( a¹+d=2b. ---(d=-4. an=-4n+34
(a¹ +2d=22. (a¹= 30
-4n+34=30. -4n=-4. n=1
So there are 30 plant in the first row
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