Please help me out with this. Not getting any approach to solve this.
Let 'k' be a +ve integer such that k+4 is divisible by 7. Then the smallest +ve integer 'n' , greater than 2, such that k+2n is divisible by 7 equals :
PS: I am confused b/w "perfectly divisible" and "divisible" rather in this case because I did a question from my same text book which is previous to this one being asked. It said "perfectly divisible". Although the question was different from this one yet I got this feeling that in "perfectly divisible" you get no remainder so is this case a different one or both the statements are used "interchangeably"
May be I am leaving out some mere details or some basic maths but its okay...often we do mistakes...so please solve this with a better explanation of the concept and especially the PS section. Thanks in advance...:)