Is the positive integer n an odd integer?
(1) n+4 is a prime number
(2) n+3 is not a prime number.
Answer: A
please help.
(1) n+4 is a prime number
(2) n+3 is not a prime number.
Answer: A
please help.
s1) n+4=prime no and nis +ve int-----> n is odd
bcoz the only prime no which is even is 2 and rest all are odd
hence n can be 3,7,13,19,27....all odd value only give a prime no.
suff
s2)
n+3 is a prime no.
if n=6(even)
n+3=9 not a prime no
if n=3 (odd)
n+3=6 not a prime no
hence insuff
