Question

In a flower garden, there are 23 plants in the first row, 21 plants in the
second row, 19 plants in the third row and so on. If there are 10 rows in
that flower garden, then find the total number of plants in the last row
with the help of the formula tp = a + (n - 1) d.​

Answer 1

Step-by-step explanation:

no. of plants in first row = t1 = 23

no. of plants in second row = t2 = 21

no. of plants in third row = t3 = 19

no. of rows in the garden = n = 10

to find:

no. of plants in the last row = t10 = ?

solution:

common difference = d = 23-21 = 21-19 = 2

a = t1 = 23

tn = a + (n - 1) d

∴ t10 = 23 + (10 - 1)2

        = 23 + (9)2

        = 23 + 18

∴ t10 = 41

Ans: The number of plants in the second row are 41.