Question

The 3rd of an ap is 15 and the sum of 6th and 10th term is 20 find the difference

Answer 1

Step-by-step explanation:

T3 = a + 2d = 15 ....... equation 1

T6 + T10 = (a + 5d) + (a + 9d) = 20

or 2a + 14d = 20

or a + 7d = 10 ........ equation 2

solving equations 1 and 2 , the common difference will be,

d = -1