What is the p'th term of -310, -612, -914, -1216, -1518?
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What is the r'th term of -78, -79, -80?
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What is the c'th term of 20, 156, 520, 1226, 2388, 4120?
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What is the m'th term of -6180, -6182, -6194, -6222, -6272, -6350, -6462, -6614?
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What is the b'th term of -31, -9, 29, 83?
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What is the a'th term of 87, 177, 269, 363, 459, 557?
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What is the a'th term of -30, -17, 4, 33, 70, 115, 168?
一个美术生