@sonukg4india It's 2.
Any power of 6 ends with 6.
Works the same way for 5.
For 7, powers which are multiples of 4 end in 1.
So
6 + 5 + 1= 12
Therefore, ans is 2.
@imsriram_ I don't regret any mistake, failure, missed opportunity in my past.I move on, telling myself there is still time left to do better things. Overthinking about future is okay if you get ideas out of that ig.