Could you please solve this, thanks

polymer in chemical engineering

(a) What is the polymerisation product of the following monomers? CH-CH2 H2N-(CH2)2NH (CH2) 2NH (CH2) 2NH2 (b) What would be the initial mole ratio of these monomers to achieve the extent of polymerisation of 0.9 and the degree of polymerisation of 10? (c) With the same initial molar ratio, what is Carothers estimation for the extent of polymerisation when gelation happens