how many terms of the series 54 5148 be taken so that their sum is 513 explain the double answer
Answers
Answered by
4
54,51,48 ,......
a=54. d=-3. An=513
513=n/2[2×54+(n-1)(-3)]
1026=n[108-3n+3]
1026=111n-3n×n
3n×n-54n-57n+1026=0
3n(n-18)-57(n-19)=0
3n-57=0. n-18=0
n=19. n=18
a=54. d=-3. An=513
513=n/2[2×54+(n-1)(-3)]
1026=n[108-3n+3]
1026=111n-3n×n
3n×n-54n-57n+1026=0
3n(n-18)-57(n-19)=0
3n-57=0. n-18=0
n=19. n=18
Similar questions