Explanation : Any number, that is divisible by 90, must be A
divisible by 9 and 10.
Now, for divisibility by 10, last digit of that
number must be '0'. And for divisibility by 9
sum of digits of that number must be divisible
Here given number is 345xy
To divisible by 10, y = 0
To divisible by 9, (3 + 4 + 5 + x + 0) must
be a multiple of 9.
12 + x = 9 x 2
x = 18-12 = 6
Hence,x+y = 6 + 0 = 6.
Explanation : 1n the process of deduction, the premises
are assumed to be true to determine! prove/
conclude what would logically follow or
will have to be true if the premises are true.
The premises are intended to provide such
strong support for the conclusion that, if the
premises are true, then it would be impossible
for the conclusion to be false. So, the relation
between premises and conclusion is that of