Question 1102306
Poor description not seem to work.

"sum of first n terms, 225"?


{{{(n/2)(3+48)=225}}}

{{{(n/2)(51)=225}}}

{{{n=450/51=8&42/51}}}------Not acceptable.  n must be a whole number.


"sum of first end term=225"----not clear; n-th term itself already given as 48.