The first and last term of G.P. are a and l respectively; r being its common ratio; then the number of terms in this G.P. is- a.(log l - log a)/log r b.l - (log l - log a)/log r c.(log a - log l)/log r d.l + (log l - log a)/log r Share with your friends Share 2 Rahul Raj answered this dear student first term of GP = alet it have n terms thennth term=lso, l=arn-1taking log on both sides, we getlogl=log(arn-1)=loga+log(rn-1)=loga+(n-1)logr(n-1)=logl-logalogrn=logl-logalogr+1 regards 2 View Full Answer Kavya answered this Its 1+ (logl-loga)/logr -1