17
There must be 67 marbles.
The fifth line will have 19 marbles. 4 5 7 11 19
18
the answer is 4
10... 9... 8... 7... 6... 5... 4 4 is the answer. ■
There must be 67 marbles.
If the pattern below following the rule starting with 10 every consecutive line has a number 1 less than the previous line how many marbles must be in the seventh line?
22 marbles are in the fifth line.
33 marbles must be in the sixth line
36
The fifth line will have 19 marbles. 4 5 7 11 19
1
36
10
the answer is 4
18
18