51 is o.k. but description should be given to novices. Three simultaneous equations Y+2R+B=43, 3Y+R=57 and R+3B=48 giving solution of R=6, B=14 and Y=17 substitute into fourth column giving 2B+R+Y= 28+6+17=51
What should be the value of the fourth column?
The sequence k, k^2, 16, k^3 has four terms in which first three terms are in GP.
What should be added in fourth term to get the last 3 terms in AP ?