Question

If 18, x, y, -3 are in A.P, then value of X+y is

Answer 1

Answer: 15

Step-by-step explanation:

x+ y = 18 +(-3) = 15

Answer 2

Answer:

first term (a) = 18

4th term of an AP is a +3d

where a is first term and d is common difference

a+ 3d = -3

3d = -21

d = -7

so second term of an AP(x) = a+d = 18 +(-7) = 11

third term of an AP(y) = a +2d = 18 +2(-7) = 18 -14 = 4

x + y = 11 + 4 = 15