U-Like Mathematics-X434of an A.P. whose first term is 5 and common dif

1.	U-Like Mathematics-X434of an A.P. whose first term is 5 and common difference is 36isis 5. Find n24. The sum of n terms25. In figure, POR is a right angled triangle in which 090. IF OS-S, shnsum of 2n terms of another A.P. whose first term is 36 and common differePR2- 4PS2-3P2Or
Answer» N/2(25+(n-1)36)= 2n/2(362+(2n-1)5 n/2(10+36n-36)= n(72+10n-5) n/2(36n-26)= n(67+10n) n/2*2(18n-13)= n(67+10n) n(18n-13)= n(67+10n) 18n-13=67+10n so,8n=80 so,n=10

U-Like Mathematics-X434of an A.P. whose first term is 5 and common difference is 36isis 5. Find n24. The sum of n terms25. In figure, POR is a right angled triangle in which 090. IF OS-S, shnsum of 2n terms of another A.P. whose first term is 36 and common differePR2- 4PS2-3P2Or

Answer»

N/2(2*5+(n-1)36)=

2n/2(36*2+(2n-1)5

n/2(10+36n-36)=

n(72+10n-5)

n/2(36n-26)=

n(67+10n)

n/2*2(18n-13)=

n(67+10n)

n(18n-13)=

n(67+10n)

18n-13=67+10n so,8n=80 so,n=10