Question 8
MediumOriginal questionA matrix has 7 elements. How many different orders can it have?
Show the answer and explanation
CorrectNot quiteAnswer C
Correct answer: C
Explanation
An order m × n needs , so m can be any divisor of 7.
The divisors give the orders 1 × 7, 7 × 1: 2 in all.
Worth noting
1 counts only m ≤ n, but 1 × 7 and 7 × 1 are different orders.
- Concept
- Possible orders of a matrix
- Typical timeTypical
- 90 s
- Your timeYours
- —
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