If nth term of an A.P is (2x+1) what is the sum of its first three terms
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an= (2x+1)
a(1)=(2(1)+1)=3
a(2)=(2(2)+1)=5
a(3)=(2(3)+1)=7
sn= 3+5+7=15
an= (2x+1)
a(1)=(2(1)+1)=3
a(2)=(2(2)+1)=5
a(3)=(2(3)+1)=7
sn= 3+5+7=15
abhijeetdash321:
Thoda ache se bataiye na samaj nahi aa raha plz
Sorry say me in English
Alright
Can u plz explain it
yes
They given that nth term is2x+1. Then we substitute x =1 in 2x+1 , we get 3..... as like that substitute x=2 we get 5 and x=3 we get 7. 3, 5 and 7 are the first three terms of an A.P. sum of first three terms are 3+5+7=15
Thank u very much
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