Speed of a 3-\(\phi\), 4-pole, 60 Hz induction motor at 75% of full-load is 1700 rpm. The speed at full-load can be
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An induction motor always slows down as mechanical load is added.
$$\text{No-Load Speed} > \text{Partial-Load Speed} > \text{Full-Load Speed}$$
Since the speed at $75%$ load is $1700\text{ rpm}$, the full-load speed must be less than $1700\text{ rpm}$. This eliminates options (1), (2), and (3) without requiring complex slip calculations.