Question

Find the sum of all 3 digit numbers less than 300 which are divisible by 7.​

Answer 1

Answer:

5586 is the correct answer

Step-by-step explanation: smallest 3 digit no divisible by 7 = 105

largest no divisible by 7 less than 300 = 294

Tn = a +(n-1)d

294=105+(n-1)7 ⇒ n=28

now, Sn = n/2 x [a+Tn]

28/2 x (105+294)

5586