2 . 3 . 4 . 15 . 12 3 . 4 . 5 . 28 . 20 4 . 5 . 6 . 45 . 30 5 . 6 . 7 . 66 . 42 6 . 7 . 8 . ?? . 56

2 . 3 . 4 . 15 . 12=======(3+2)*3=15 3 . 4 . 5 . 28 . 20=======(3+4)*4=28 4 . 5 . 6 . 45 . 30=======(4+5)*5=45 5 . 6 . 7 . 66 . 42=======(5+6)*6=66 6 . 7 . 8 . ?? . 56=======(6+7)*7=91

The Answer will be 91.

Find the number that comes next in the following series:

3, 7, 12, 14, 16, 19, 21, 25, 30, 41, 45, 52, 54, 56, 59, 61, 65, 70, ?

1 2 3 4 5 6 7 8 9 = 100 Challenge: Place + and - math symbols between the numbers above to make the equation true. Use + and - a total of three times. Do not rearrange the numbers.