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In a flower bed, there are 23 rose plant...

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. Then, the number of rows in the flower bed is.

A

15

B

18

C

10

D

9

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • Assertion (A) : There will be 10 rows in the flower bed if there are 23 plants in the first row , 21 in the second row , 19 in the third and so on .Also 5 rose plants are in the last row. Reason (R ) : Sum of first n terms of an A.P is given by S_(n)=(N)/(2)[2a+(n-1)d] .

    A
    Both A and R are true and R is the correct explanation for A.
    B
    Both A and R are true and R is not correct explanation for A.
    C
    A is true but R is false.
    D
    A is false but R is true.

  • 1225 plants are to be planted of rows. Find the number of rows and the number of plants in each row.

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