30. Star mark question: X = 101102103….150 (writing 101, 102, 103,… 150 together ) what is the remainder when X is divided by 9.
a. 1
b. 2
c. 3
d. 4

• (150*151)/2-(100*101)/2=6275
  6275%9=2
• 9 years agoHelpfull: Yes(4) No(1)
• you can do it this way:
  n(n+1)/k where n=number of terms and k= the divisor
  so here the no. of terms are 49 (101-150) and k=9. So (49*50)/9 gives a remainder of 2
• 8 years agoHelpfull: Yes(1) No(1)