Question

Three out of seven students in the cafeteria line are chosen to answer survey questions. How many different combinations of three students are possible? 7 35 70 210

Answer 1

The correct answer is definitely 35.

Step-by-step explanation:

There is a trick for this kind of question. If it were only two numbers, you could take 7 times one less in the sequence. 7 times 6, which results in 42. However, since there are three numbers, you would take the next number in the sequence multiplied by 7. So, 7*5=35. I hope this helps!

Answer 2

1 2 3 4 5 6 7

123
124
125
126
127
134
135
136
137
145,
146,
147
156
157
167
234
235
236
237
245
246
247
256
257
267
345
346
347
356
357
367
456
457
467
567
The answer is 35