Question

If 15,k,-1 in AP find the value of k

Answer 1

Answer:

a= 15 a2=k and a3 = -1 d= k-15

Step-by-step explanation:

a3= a+2d

-1 = 15+2X (k-15)

-1= 15+2k-30

-1 = 2k-15

-2k = -15+1

-2k= -14

k= 2

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Answer 2

Answer:

k = 7

Step-by-step explanation:

15 , k , -1

If they are in A.P. then their common difference is same.

==: k - 15 = -1 - k

==: 2k = 15 - 1

==: 2k = 14

==: k = 7

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