Identifying Premises - GMAT Verbal

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Question

Though it has held true for more than half a century, the predictive maxim known as Moore’s Law, which famously supposes that the processing power of computer chips will double approximately every two years, will almost certainly fail to hold in the next ten years. Plainly, the only way to ensure that processing power continues to increase at the predicted rate would be either to continue to reduce the size of the transistors that are the source of all chips’ processing power or to fit additional transistors onto each chip. The former is impossible, as the fundamental barrier to further transistor miniaturization, the size of the atoms of silicon of which the transistors are composed, will be reached in but five years’ time, perhaps less. Since reducing the size between chips is similarly constrained by this atomic barrier; thus, the only realistic hope of substantially increasing transistor density that remains is the “sandwiching” of chip components, the further layering of transistor atop transistor. While transistor layering is integral to modern chip design, it, too, is unlikely to develop swiftly enough for the hoped for doubling of processing power to materialize. Sadly, Mr. Moore’s much vaunted prediction will not last the decade.

In the argument given above, the two underlined portions play which of the following roles?

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Answer

The presence of underlined portions always indicate that the test maker is interested in the relationship between two different parts of the argument. This argument is somewhat complicated, but essentially follows this form: A & B are the only ways to do C. A is impossible. B could itself be accomplished in two ways, D & E. D is impossible and E is unlikely. Therefore, it’s likely that C will not occur. The second bolded statement is thus the argument’s conclusion, the first bolded statement is part of the evidence that the all the possibilities are either impossible or unlikely.

The prediction made elsewhere is that transistor layering is unlikely to develop swiftly enough. This, with the claim in the first bolded statement would support the conclusion.

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