3,K–2 ,5 are in AP .Find K
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Answer:
A
1
=2K
A
2
=3K−1
A
3
=8
D=D
A
2
−A
1
=A
3
−A
2
3K−1−2K=8−(3K−1)
K−1=8−3K+1
K+3K=8+1+1
4K=10
K=
4
10
K=2.5
we get, K=2.5
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