How many natural numbers between 23 and 137 are divisible by 7? Choose the correct choice from the following: A) 12 B) 17 C) 16 D) 13 E) 15

Rationale: "solution : these numbers are 28 , 35 , 42 , … . , 133 . this is in a . p . in which a = 28 , d = ( 35 - 28 ) = 7 and l = 133 . let the number of there terms be n . then , tn = 133 a + ( n - 1 ) d = 133 by solving this we will get n = 16 . answer c"
Answer: C