Question

One row has 15 chairs. Find the rule that gives the total no. of chairs given to the no. of rows. (Use 'n'for the no. of rows) Algebra

Answer 1

Answer:

ARITHEMATIC PROGRESION

Step-by-step explanation:

sum of no.of rows=

$\frac{n}{2}(2a + (n - 1)d)$

'a' stands for no.of chairs in the first row.

'n' is given in the question itself.

'd' stands for difference between no.of chairs in the first row and the second row.