I have a blogger account which houses three completely different blogs. I'm thinking of signing up for adsense but I'm scared a different type of ads may be placed on a my blogs since I'm using the same adsense account for the three of them. Please I hope you understand what I'm trying to say. I would appreciate clarification, thank you.

Kensharval, I am not a big fan of Blogger, but I think the solution to your problem is fairly straight forward. Let's see how.
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If I got you correctly, you said you're running 3 different blogs in a single Blogger account, and that you want to launch Google Adsense but not on all the 3 blogs, am I right? If yes, then I think that is possible.
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Your Blogger account identifies you as the true owner of all the blogs you're running. So for Google Adsense to work, you must specify a blog or website where the ads will be sent. In your own case, you must specify one of the three blogs where Google will send ads to.
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P.S. While this is purely based on my experience as a web designer, you may want to research or do more findings regarding this. Thanks and goodluck.

Kensharval:
I have a blogger account which houses three completely different blogs. I'm thinking of signing up for adsense but I'm scared a different type of ads may be placed on a my blogs since I'm using the same adsense account for the three of them. Please I hope you understand what I'm trying to say. I would appreciate clarification, thank you.

you have option to insert the ads on each blog once you are approved. The ads will not display on all the blogs if it is not inserted to each of them

bedfordng:
you have option to insert the ads on each blog once you are approved. The ads will not display on all the blogs if it is not inserted to each of them

Exactly what I said... Thanks...