What does 7c2 equal?

Answer 1

As given it is the coefficient in a binomial expansion.

One the calcultor

'Clear; , '7', 'nCr', '2', .=. '21'.

Algenraically

7! / ( 2!(7-2)!)

7! / 2!*5! =

7 x 6 / 2 x 1 = 42 / 21 = 21

The exclamation mark '!' means factorial. Hence 7! , 7 factorial = 7x6x5x4x3x2x1.

However, On a different 'pitch', do you mean '7c^(2)' , which is 'seven 'c' squared'. Which will give a completely different result.

Answer 2

21