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Re: OG 12th Ed. question #89 [#permalink]
27 Jan 2010, 10:50
This problem seems confusing but it's quite easy.
First, there are two sets of numbers: set "t" and set "s". The product of the set "s" is equal to The product of the set "t" EXCEPT this set has an additional number (201). This can be summarized like this:
Set "s": 101 * 102 * 103 *......200 = s
Set "t": 101 * 102 * 103 *......200 * 201 = t
t = s * 201 = 201s
and if t = 201s then s = t / 201 ========> this is the equation you have to plug into the stem equation.
Your next step is to solve the stem's equation:
If 1/s + 1/t then this equation is equal to 1/(t/201) + 1/t
So, applying the dobble C you get 201/t + 1/t = (201+ 1)/t = 202/t.