An RNA oligonucleotide has the sequence A6C7U6. It canform a hairpin loop held together by a maximum of sixA U base pairs:A A A A A AU U U U U UCCC C CCCAssume that the helical region can melt only from either end.Use the notation s = equilibrium constant for adding a basepair to a helical region and sjws = equilibrium constant forinitiating the first base pair forming a loop. The subscriptj = 7, 9, 11, 13, 15, 17 characterizes the number of unpairedbases in the loop.a. Calculate the statistical weight of each species that canbe present.b. Calculate the mole fraction of each species that can bepresent.c. Assume that the molar absorptivity of each species dependson only the number of base pairs formed: e0 = absorptivityper mole of mononucleotide for species with no base pairs,e1 = absorptivity of all species with one base pair, etc.Write an expression for the absorbance in a 1-cm cell of asolution of AA6C7U6 in terms of s, sj, ej and c = concentration of AA6C7U6 in moles of nucleotides per lit