If x, (x^3+1) and x^4 are in arithmetic progression,then what will be possible sum of 3 terms of arithmetic progression? ( given that x is real number )
1) 1/2 2) 1 3) 3/2 4) 2 5) 5/2 6) 5/3 7) 5/4 8) 7/6 9) 6/13 10) 3/16
Sum of first 13 terms of an arithmetic progression is 312. What is the sum of the first 14 terms, if the first term and the common difference are positive integers?
