久等了，北美 2026 SIG Quant OA 终于来了！这套测试真的是万年不变：1小时，17道题，逻辑、概率、速算、脑筋急转弯全混合。最近我已经陪着学员做了好几轮，发现题库依旧稳定，但细节还是会有一些小变化。整体感觉：节奏快、时间紧，考的不是知识点，而是逻辑敏捷度和反应速度。
SIG Quant OA 高频题型总结
| 类型 | 题目风格 | 难点 | 建议 |
|---|---|---|---|
| Logic Puzzles | 谁说真谁说假 / 座位排列 | 条件冗余 | 建表 or 代号法 |
| Probability | Cards, Dice, Coin Toss | 联合概率计算 | 分情景 / 余数法 |
| Mental Math | 大数乘除 / 分数比较 | 时间紧 | 平方差、近似法 |
| Sequences | 数列找规律 | 容易想偏 | 代入验证 |
SIG Quant Online Assessment 真题分享
Question 1:
You walk into a barn and see a collection of spiders, chickens, and cows. You notice that there are 520 legs in total. The number of chickens is twice the number of cows and the number of spiders is twice the number of chickens. Compute the number of spiders.
Question 2:
I need to seat 5 toddlers (Anna, Brian, Charlie, Dixie, Eva) at a round table with these rules:
i) Anna won’t sit next to Brian or Eva.
ii) Brian won’t sit next to Charlie.
iii) Dixie won’t sit next to Eva or Charlie.
If Dixie is sitting to the left of Anna, who is sitting to the left of Bri.
Question 3:
1000 people were surveyed about their preferred method of exercise. The table shows results by age group.
If you meet a 33-year-old who took the survey, compute the probability she prefers swimming.
| – | 18 – 22 | 23 – 27 | 28 – 32 | 33 – 37 | T |
|---|---|---|---|---|---|
| Run | 54 | 40 | 42 | 66 | 2 |
| Bike | 77 | 68 | 90 | 70 | 3 |
| Swim | 28 | 43 | 50 | 52 | 1 |
| Other | 90 | 78 | 71 | 81 | 3 |
| Total | 249 | 229 | 253 | 269 | 1 |
Question 4
Compute the weight of the green triangle in pounds if the following system is balanced and weighs 96 pounds in total.
[There is an image of a balanced system labeled “96 lbs” with various shapes.]
Question 5:
Factory A makes 40% red widgets and 60% black widgets. Factory B makes 80% red widgets and 20% black widgets. Two widgets are sampled uniformly at random from one of the companies, also selected uniformly at random. The widgets are both red. Compute the probability they were from Factory A.
Question 6:
You roll three fair 6-sided dice. If they all show the same number, you earn $20. If exactly two of the numbers are the same, you earn $10. If all of the numbers are different, you lose $2. Compute your expected return per roll in dollars. (Round to the nearest cent.)
专属助攻，不再一个人硬扛
SIG Quant OA 真的很考验临场状态：逻辑绕得人头大，概率题时间紧，心算又不能出错。很多同学明明刷过不少题，实战还是被卡在节奏上。
Programhelp提供的就是专属远程面试助攻服务：
无痕面试辅助，实时共享文档，提前调试设备；
实时语音提醒，帮你在面试中实时语音提醒，不会在题目上浪费过多时间；
隐形辅助，不卡屏、不留痕，确保安全稳定。
有了这种支持，你就像多了个隐形队友，节奏和心态都能稳住。这样一来，不仅能在 SIG OA 中拿高分，面对 IMC、Optiver 等其他 quant firm 的测试也会更加游刃有余。
