Find the sum of numbers divisible by 13 between 100 to 400
Answers
Answered by
0
Numbers
an = 400/13 = 30 30 x 13 = 390
a = 100/13 = 7 13 x 8 = 104
390 = a + (n-1)d = 104 + 13n - 13
390 - 91 = 13n
n = 299/13 = 23
Sum = 23/2 (104 + 390)
23/2 x 494 = 23 x 247 = 5681
Similar questions