Explain in how many ways the four valencies of the carbon atom can be displayed. , 11 | ,

The number of valence electrons in carbon atom is

PASSAGE-II : In all the organic compounds, the four valencies of carbon atom must be satisfied, either by single, double or triple bonds. It is not possible to get a compound in which the carbon atom has valencies either less or more than four. In these compounds carbon atoms can be linked together in the form of straight chains, branched chains or even ring chains. The compound in which a double bond is present between two carbon atoms is

In how many ways the sum of upper faces of four distinct die can be five?

In how many ways can a team of 11 players be selected from 14 players?

How many ionisation energies can carbon have?

In how many ways can four persons each throwing a dice,once,make a sum of 13?

Case 1 -In how many ways the sum of upper faces of four distinct dices can be 6?