Question

how many numbers between 200 and 600 is divisible by 14

Answer 1

Total no.(s) b/w 200 &600 =400
No. divisible by 14 b/w 200&600 are 210,224,238...588.
Total no. b/w 200&600 divisible by 14 are
588 = 210 +(n-1)14
378=14n-14
392=14n
=> n=28

Answer 2

first no. divisible by 14 = 210
last no.(An) = 588

now (An) = A +(n-1)D
588 = 210 +(n-1)14
378 = 14n - 14
392 = 14n
n = 28