Asquare and a circle intersect so that each side of the square contains a chord of the circle equal in length to the radius of t
1 answer:
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a. The first part asks for how many ways they can be seated together in a row. Therefore we want the permutations of the set of 6 people, or 6 factorial,
6! = 6 5
= 30 4
= 360 2 = 720 possible ways to order 6 people in a row
b. There are two cases to consider here. If the doctor were to sit in the left - most seat, or the right - most seat. In either case there would be 5 people remaining, and hence 5! possible ways to arrange themselves.
5! = 5 4
= 20 3
= 120 1 = 120 possible ways to arrange themselves if the doctor were to sit in either the left - most or right - most seat.
In either case there are 120 ways, so 120 + 120 = Total of 240 arrangements among the 6 people if the doctor sits in the aisle seat ( leftmost or rightmost seat )
c. With each husband on the left, there are 3 people left, all women, that we have to consider here.
3! = 3 2 6 ways to arrange 3 couples in a row, the husband always to the left
Factorization of the trinomial
3x^3 +6x^2 -24x
will be :-
taking common 3x
=>3x(x^2+2x-12)......1️⃣
now the factorization of (x^2+2x-12) will be
(x-2)(x+4).......2️⃣
so your answer from 1️⃣and 2️⃣ is (A) 3x(x-2)(x+4).
Hope it helped you.