class consists of 15 students and a teacher. The teacher writes a natural number on the board and asks students to tell something about the number. The first student says, “This number is a multiple of 1”. The second student says, “This number is a multiple of 2” and so on till the 15th student. The teacher notices that all but two of them were correct in their statements and both of them spoke one after the other consecutively. Which two students were not correct?

1) 8 & 9
2) 13 & 14
3) 9 & 10
4) 11 & 12

• 1) 8 & 9
  
  were not correct.
  as number is definitely divisible by 14 when divisible by 2 and 7.
  .........................10, .......... 2 and 5.
  .........................12,.............3 and 4.
• 11 years agoHelpfull: Yes(0) No(5)