Question

1,3,5,7,9,11,13,15. The sum of any 3of them =30

Answer 1

generally this is not possible
but when we use some mathematical operation e.g factorial then this can be possible .

take first number 15
second number factorial of 3
and 3rd is 9
we know ,
3 ! = 3 × 2 × 1 = 6

now,
add 15 + 3 ! + 9 = 15 +6 +9 =30