Question

Let's see who is the real brainy(Mind hacker) by giving me the answer of the question till the end of that mounth(September)
So the question is that,If
⬇⬇⬇
abc+ab+bc+ca+a+b+c=1000
than find the value of a+b+c=?
Let wait and watch?
Friends your time starts now!!!
​

Answer 1

(a+1)(b+1)(c+1) = a+d+c+ab+bc+ca+abc+1

So we can rewrite this equation

a+b+c+ab+bc+ca+abc=1000

as  

(a+1)(b+1)(c+1) - 1 = 1000

so

(a+1)(b+1)(c+1) = 1001

which can be re written as

(a+1)(b+1)(c+1) = 7*11*13

if you look at this equation closely, these 7, 11 and 13 are prime numbers and can be rewritten as (6+1)*(10+1)*(12+1)

So you can find that a+b+c = 28.