AMC8 1993
AMC8 1993 · Q24
AMC8 1993 · Q24. It mainly tests Counting in geometry (lattice points), Patterns & sequences (misc).
What number is directly above 142 in this array of numbers? [triangular array 1 to ...]
在这个数字阵列中，142 正上方的数字是什么？[三角阵列 1 到 ...]
(A)
99
99
(B)
119
119
(C)
120
120
(D)
121
121
(E)
122
122
Answer
Correct choice: (C)
正确答案：（C）
Solution
Rows end squares: line with 142 ends 144, above ends 121, so above 142 is 120.
行以平方数结束：包含 142 的行以 144 结束，其上一行以 121 结束，因此 142 上方是 120。
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