Answer please
12th question
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use the condition of AP
i.e.a3- a2=a2-a1
2k-7-(6k-2) = 6k-2-(8k+4)
2k-7-6k+2 = 6k-2-8k-4
-4k-5 = -2k-6
-4k+2k = -6+5
-2k = -1
k = 1 by 2
hope this helps...