What two numbers add up to 10 and multiply to 21
1 answer:
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Solution :
a). is true
Then , is true.
is true
is true.
Therefore, we see that is true for all the even integers :
b). is true
Then , is true.
is true
is true.
Therefore, we see that is true for all the multiples of 3 :
c). and
is true, then
is true
and
is true, then
is true.
and
is true, then
is true.
So, we observe that is true for all the non- negative integers :
.
d). is true,
So, and
is true or
and
is true.
Now, is true.
Again, and
is true or
and
is true.
Now, is true.
Again, and
is true or
and
is true.
Thus,
is true for all the non- negative integers except 1 :
.