a =7, b = 5, c = 3 ; a ²+ b ² + c ² - ac - bc - ab=?
A12
B10
C8
D6
A12
B10
C8
D6
Related Questions:
Ahild asked a flock of birds,
How many are you ?
A bird replied.
We and us again,
With half of us
And half of that
With one more,
Would make hundred
How many birds were there ?