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 one year ago
The sum of first 14 terms of 1,1.4,1.8,.... is equal to the sum of first n terms of 5.6,5.8,6.0,.... , find the value of n
 one year ago
The sum of first 14 terms of 1,1.4,1.8,.... is equal to the sum of first n terms of 5.6,5.8,6.0,.... , find the value of n

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sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.11,1.4,1.8,.... This is in AP with first term 1 and common difference 0.4

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1Use sum formula of AP

amoodarya
 one year ago
Best ResponseYou've already chosen the best response.014/2(a1+a14)=n/2(5.6+5.6+(n1)*0.2)

amoodarya
 one year ago
Best ResponseYou've already chosen the best response.014/2(1+1+13(.4))=n/2(5.6+5.6+(n1)*0.2)

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0i did the first A.P and its coming 50.4

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1S14 =14/2 {2*1 + (141)0.4} = 50.4

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.15.6,5.8,6.0,.... This is in AP with common difference 0.2 andfirt term 5.6

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0\[50.4=\frac{ n }{ 2 }[(2*5.6)+(n1)*0.2]\]

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1Sn=50.4 n/2 { 2*5.6 + (n1)0.2}=50.4 n{11  0.2n}=100.8

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.111n 0.2n^2 =100.8 11n 2/10 n^2 =100.8 110n 2n^2 =1008

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1110n 2n^2 =1008 2n^2110n+1008=0 n^255n+504=0

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0how did became 110n 2n^2 =1008

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1dw:1359028396466:dw

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1Now,n^255n+504=0 CAN u solve for n

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0n= 11.61 and n= 43.38

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0The Answer should come n=8...i checked the answers

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1n=8 is surely not the correct solution

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0the book says that answer is n=8

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0how will it come 8

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1Sorry I did a algebra mistake

koli123able
 one year ago
Best ResponseYou've already chosen the best response.0how????? plz plz tell me

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1Sn=50.4 n/2 { 2*5.6 + (n1)0.2}=50.4 n/2 {11+0.2n}=50.4 n{11+0.2n}=100.8 11n+0,2n^2=100.8 11n +2/10 n^2 =100.8 110n+2n^2=1008 55n+n^2=504 n^2+55n504=0 n^2+(638)n504=0 n^2 +63n 8n504=0 n(n+63)8(n+63)=0 (n8)(n+63)=0

sauravshakya
 one year ago
Best ResponseYou've already chosen the best response.1Now, either n8=0 n=8 OR n+63=0 n=63 BUT n cannot be negative So, n=8
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