Question

sport committee 12 teams participate they played against each other how many matches were played​

Answer 1

Answer 672

It forms an Ap whose first term is 1

And common difference is 11 (because they can't play with self )

And no of terms is 12

》sn = 12/2 (2×1 +(12-1)11)

= 6 (2+10×11)

= 6 (112)

= 672