What will come in place of question mark (?) in the given number series ?
The pattern is :
8 + $12$ = 20
20 + $12 + 3$ = 35
35 + $12 + 3 + 4$ = 54
54 + $12 + 3 + 4 + 5$ = 78
78 + $12 + 3 + 4 + 5 + 6$ = 108
The pattern is :
8 + $12$ = 20
20 + $12 + 3$ = 35
35 + $12 + 3 + 4$ = 54
54 + $12 + 3 + 4 + 5$ = 78
78 + $12 + 3 + 4 + 5 + 6$ = 108