Question

If 18,x ,y , −3 are in AP, then the value of x+y.

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Answer 1

Answer:

15

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Step-by-step explanation:

Here, x and y are Arithmetic means between 18 and -3

SO,

t n = a + ( n-1 ) d

or, -3 = 18 + ( 4 -1 )* d

or, d= -21/3 = -7  

Now,

x = t 2= a + d =   18 + ( -7 ) = 11

y = t 3 = a +2d = 18 + 2 * ( -7 )  = 4

SO,

x + y = 11 + 4 = 15.