. If 2k, 3k - 1,8 are in A.P., then what is the value of k?
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ANSWER :
They are in AP therefore we can use the formula,
2b = a + c
2(3k - 1) = 2k + 8
6k - 2 = 2k + 8
4k = 10
k = 10/4 = 5/2
OTHER METHOD
In an AP, common difference is same
Therefore, a2 - a1 = a3 - a2
3k - 1 - 2k = 8 - 3k + 1
k - 1 = 9 - 3k
4k = 10
k = 10/4 = 5/2
Hope it helps....
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Step-by-step explanation:
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