If the sum of two extreme numbers of an A.P. with four terms is 8 and product of remaining two middle term is 15, then greatest number of the series will be [Roorkee 1965] A) 5 B) 7 C) 9 D) 11 Share with your friends Share 0 Shreya Sarkar answered this Ans = ( B ) 7 . 2 View Full Answer