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kotykmax [81]
3 years ago
5

1. Find a solution to the following system of equations. -3x +3y = -9 -3x + y = 7

Mathematics
1 answer:
Softa [21]3 years ago
3 0
X=-5 y=-8
subtract the equation and then substitute it in
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Find the number of the different ways, for 3 students to sit on 7 seats in one row.
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210

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Here comes the problem from Combination.

We are being asked to find the number of ways out in which 3 students may sit on 7 seats in a row. Please see that in this case the even can not be repeated.

Let us start with the student one. For him all the 7 seats are available to sit. Hence number of ways for him to sit = 7

Let us see the student second. For him there are only 6 seats available to sit as one seat has already been occupied. Hence number of ways for him to sit = 6

Let us see the student third. For him there are only 5 seats available to sit as two seat has already been occupied. Hence number of ways for him to sit = 5

Hence the total number of ways for three students to be seated will be

7 x 6 x 5

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