Question

if 70,k,100 are in A.P. then what is the value of k?

Answer 1

Step-by-step explanation:

Since they are in AP

k-70=100-k

2k=170

k=85

Answer 2

Answer:

85

Step-by-step explanation:

a1 = 70 ---------- 1

a3 = 100 ----------2

by solving 1 & 2

a + 2d = 100

a = 70

--------------------

2d = 30

d = 30/2

d = 15

Therefore,

a2 = a + d

a2 = 70 + 15

a2 = 85

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