Question

Find the sum of m terms of an AP, a-3d,a-2d,a-d,a,a+d,a+2d+..........

Answer 1

hello users 
according to the formula,

the sum of n terms of A.P= n/2(2a +(n-1)d)
here,
sum of m terms of A.P =m/2{ 2(a-3d) + (m-1)d}
 =m/2{2a -6d +md -d}
 =m/2{2a -7d +md }
 =m/2{2a +(m-7)d}   

Hence
the sum of m terms of A.P =m/2{2a+(m-7)d} answer

hope it helps...


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Answer 2

Answer:

Step-by-step explanation x2+y2 cos they a