Question

if sum of first mth term of an ap is the same as the sum of its fierst nth term show that sum of it m+n =0​

Answer 1

Step-by-step explanation:

m/2{2a + (m-1)d} = n/2{2a + (n-1)d}

→2am + m^2d - md- 2an -n^2d + nd =0

→(m-n ){2a + (m+n-1)d}=0

→{2a+(m+n-1)d}=0

→(m+n)/2{2a + (m+n-1)d}=0

thus , S (m+n)=0

Answer 2

Answer:

that is the right answer

Step-by-step explanation:

it