Question

find sum of integer between 25 and 100​

Answer 1

Answer:

AP

is

25,26,27.......100

tn = 100 = l

a = 25

d = 1

tn = 100 = a +(n-1)d

100 = 25 +(n-1)(1)

75 = n-1

n = 76

S76 = n/2 x (a+l)

S76 = 76/2 x (25+100)

S76 = 38 x 125

S76 = 4750

sum of integer between 25 and 100 is 4750