Answer:
156 different pairs will be there.
Step-by-step explanation:
As the order is essential as we need different pairs therefore permutations will be used.
A permutation is any ordered subset of the objects r selected with regard to their order, from the set of n distinct objects. It is given by nPr where n> r
Total number is 13 and required number is 2
n= 13 and r= 2
13 P2= 156 possible combinations.
A combination is any subset of the objects r selected without regard to their order, from the set of n distinct objects. It is given by nCr where n> r
Answer:
5.5
Step-by-step explanation:
You divide 27 by 5.
Answer:
the second description and and expression is correct
Step-by-step explanation:
the first one is wrong because it says 7 minus while it should be minus 7
Answer:
The cost of chair is 
The cost of a lamp is 
The cost of a table is 
Step-by-step explanation:
Let
x----> the cost of chair
y----> the cost of lamp
z----> the cost of table
we know that
----> equation A
-----> 
-----> equation B
------> equation C
substitute equation C and equation B in equation A and solve for x
Find the value of y
Find the value of z
therefore
The cost of chair is
The cost of a lamp is
The cost of a table is
