A number is divisible by 6 . If it divisible by 2 and 3 also. ⋆ Divisibility of 2→ If last digit of number is divisible by 2 that number will be divisible by 2. ⋆ Divisibility of 3→ If sum of digit is divisible by 3 that number will be divisible by 3. Number =7+2+k+4+6+0+k =19+2k If we put k=4 =19+2×4 =19+8 =27 is divisible by 3 and is also divisible by 2. The value of k=4