Multiple Choice Question (MCQ)
What is the first term a_1 and the common ratio r of the following geometric sequence if the second, third and fourth terms are: -2, -1, -\dfrac{1}{2} ?
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✓
a_1 = -4 and r = \dfrac{1}{2}
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×
a_1 = 4 and r = \dfrac{1}{2}
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×
a_1 = \dfrac{1}{2} and r = -4
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×
a_1 = -4 and r = -\dfrac{1}{2}