1.

16 + 17 + 15 .. + 40 तक का मान होगा ?(i) 820 (i) 720 (iii) 684

Answer»

sum of n numbers = n(n+1)/2therefore sum of 40 no.s= 40*41/2= 820sum of 15 no.s = 15*16/2 = 120

16+17+18+....+40= sum of 40 no.s - sum of 15 no.s = 820-120=700.



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