What is the r'th term of -8, -18, -34, -56, -84, -118, -158?
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What is the c'th term of -84, -92, -100, -108?
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What is the l'th term of -91, -117, -143, -169, -195?
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What is the m'th term of -52, -112, -188, -286, -412, -572, -772, -1018?
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What is the b'th term of 16, 36, 84, 172, 312, 516, 796?
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What is the b'th term of 1397, 2796, 4195, 5594?
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What is the r'th term of -29, -65, -117, -179, -245, -309, -365, -407?
一个美术生