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题库 / Prep2007E2-DS-120
If n is the product of the least and the greatest of 6 consecutive integers, what is the value of n ?
(1) The greatest of the 6 consecutive integers is 20.
(2) The average (arithmetic mean) of the 6 consecutive integers is 17.5.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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【整数奇偶数】6个连续整数
1-最大一个整数是20；可以推出最小一个数，那他们的乘积就可以知道了，充分；
2-6个数的平均数是17.5，可以退出中间两个数，那么最大最小数也知道了，充分
分别都充分
a1+an an=a1+(n-1)d
2)用等差数列求和公式，把第一项求出来，其他就可以了。