# The determinant

The determinant of the unit matrix equals 7. Check how many rows the A matrix contains.

Result

n =  7

#### Solution:

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
Be the first to comment!

## Next similar examples:

1. Inverse matrix
Find how many times is the larger determinant is the matrix A, which equals 9 as the determinant of its inverse matrix.
2. The inverse
The inverse matrix for matrix A has a determinant value of 0.333. What value has a determinant of the matrix A?
3. Inverse matrix
Find out inverse by Gauss elimination or by reduction method. A=[2/3. 1 -3. 1/3]
4. Roots
Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?
5. Balls
We have n identical balls (numbered 1-n) is selected without replacement. Determine 1) The probability that at least one tensile strength number coincides with the number of balls? 2) Determine the mean and variance of the number of balls, which coincides.
6. AS sequence
In an arithmetic sequence is given the difference d = -3 and a71 = 455. a) Determine the value of a62 b) Determine the sum of 71 members.
7. The confectionery
The confectionery sold 5 kinds of ice cream. In how many ways can I buy 3 kinds if order of ice creams does not matter?
8. Trinity
How many different triads can be selected from the group 43 students?
9. Linsys2
Solve two equations with two unknowns: 400x+120y=147.2 350x+200y=144
10. Derivation
Exists a function whose derivation is the same function?
11. Theorem prove
We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
12. Sequence 3
Write the first 5 members of an arithmetic sequence: a4=-35, a11=-105.
13. Euclidean distance
Calculate the Euclidean distance between shops A, B and C, where: A 45 0.05 B 60 0.05 C 52 0.09 Wherein the first figure is the weight in grams of bread and second figure is price in USD.
14. Median and modus
Radka made 50 throws with a dice. The table saw fit individual dice's wall frequency: Wall Number: 1 2 3 4 5 6 frequency: 8 7 5 11 6 13 Calculate the modus and median of the wall numbers that Radka fell.
15. Calculation
How much is sum of square root of six and the square root of 225?
16. 75th percentile (quartille Q3)
Find 75th percentile for 30,42,42,46,46,46,50,50,54
17. Calculation of CN
Calculate: ?