Hint: Mnemonic device.
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By the way, here is another cute SAT problem from David Marain, in his words, "solvable by 7th-graders" (as long as they understand how to visualize fractions and how to perform simple inductive thinking):
If 1 - (1/2 + 1/4 + 1/8 + 1/16 + ... 1/(2^N)) = 1/(2^2010), then N = ?
algebra or geometry?
ReplyDeleteMy guess for geometry would probably be an alternate for soh-cah-toa
Hmm. It's for a much simpler concept (used very prevalently in science).
ReplyDelete