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Sunday, April 1, 2007
"ALGEBRA QUESTION OF THE DAY"
If the sum of two prime numbers x and y is odd, then the product of x and y must be divisible by (A) 2 (B) 3 (C) 4 (D) 5 (E) 8
a . is the answer any prime number other than two is odd and sum of two odd numbers is always even as such among x and y one has to be 2 for x+y to be odd therefore x*y should always be divisible by 2
the first two prime numbers are 2 and 3 and their sum is odd(5)
ReplyDeleteso the product is divisible both by 2 and 3
so why it is not B
A
ReplyDelete@above
dude,it is asked in qs tht it must be divisible by the ans...
6 is divisible by A)2
ReplyDeleteand B)3 so is 3 not in the answer
a . is the answer
ReplyDeleteany prime number other than two is odd
and sum of two odd numbers is always even as such among x and y one has to be 2 for x+y to be odd
therefore x*y should always be divisible by 2
a
ReplyDeletetake one more eg say 11 and 2
11*2=22
divisible by 2
A
ReplyDelete