Please solve Q.7 of miscellaneous exercise on chapter 9 from class 11ncert book

(Also tell ? represents what ??)

Dear Student,
Please find below the solution to the asked query:

 means addition for given limits of summation variable.e.g.r=15 r2 means we have value of r from 1 to 5 in r2 and add each term and r is called summation variabler=15 r2=12+22+32+42+52=1+4+9+16+25=55Similarly x=1n fx=f1+f2+f3+.....+fn

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