Correct option:
Explanation:
given: [axp + (b / xq)]n
Tr+1 = ncr an–r br
∴ Tr = ncr–1 an–r+1 br–1
∴ Tr = ncr–1 ∙ (axp)n–r+1 (b / xq)r–1
∴ rth term is constant
∴ xpn–pr+p ∙ [1 / xqr–q] = 1
i.e. xpn+p+q–pr–qr = x0
∴ pn + p + q = (p + q)r
∴ r = [(pn + p + q) / (p + q)]
∴ r = 1 + [(pn) / (p + q)]