Bhagyashree Mukherje Yes
266+1 ≠ 267. As it is base=7 so the digits can't be >=7.
So 7 has to be written in base 7 form which is
i.e. 10. sum=0 and carry=1.
Again 6+1(carry) = 10 => sum=0 and carry=1
2+1=3 sum=3 carry=0
So, 266+1 = (300)7
Shubham Aggarwal Do let me know if you can understand this