x2(1+x)98+x3(1+x97)+x4(1+x)96+....... x54(1+x)46 Coeff. of x70:98C68+97C67+96C66+.......... 47C17+46C16 =46C30+47C30+..........98C30 =(46C31+46C30)+47C30+...........98C30−46C31 =47C31+47C30+...........98C30−46C31 ....... =99C31−46C31=99Cp−46Cq Possible values of (p+q) are 62,83,99,46 ⇒p+q=83