Question

if first term of an A.P is X, second term is Y and last term is z then show that sum of all terms is X+z y+z-2x/2-x+y​

Answer 1

x , y ..........z

d = y - x

a = x

sum = n / 2 [ first + last ]

= n / 2 [ x + z ]

Tn = a + ( n - 1 ) d

z = x + ( n - 1 ) y-x

z- x / y - x = n - 1

n = z - x / y- x +1

n = z - x + y - x / y-x

n = z + y -2x / y-x

so sum = (x +z) (y + z-2 x) / 2 (y - x)

Hope it helps

Hope it helps mark brainliest_mate_✌✌