Question

in an ap mth term is n. nth term is m then find the sum of (m+n)th term​

Answer 1

Step-by-step explanation:

Tm = a+(m-1)d

Tn = a+(n-1)d

then-

T(m+n) = 2a+(m+n-2)d

now-

S(m+n) = n/2(a+l)

= n/2 (a+ 2a+(m+n-2)d

= n/2(3a+(m+n-2)d Ans...