Subtract 4 each time.
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The 13 should be 31... then 1+1+1=3 1+1+3=5 1+3+5=9...
18. The pattern is add 5, then subtract 1.
1 5 9 13 17 21
+5
There are 10 possible combinations so 60 possible permutations. The combinations are:(1, 3, 21), (1, 5, 19), (1, 7, 17), (1, 9, 15), (1, 11, 13),(3, 5, 17), (3, 7, 15), (3, 9, 13), (5, 7, 13), (5, 9, 11).
The 13 should be 31... then 1+1+1=3 1+1+3=5 1+3+5=9...
18. The pattern is add 5, then subtract 1.
18. The pattern is 3+1=4, 4+2=6, 6+3=9, 9+4=13, so 13+5=18
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13 - 5 + 112 = 9
1 5 9 13 17 21
13...... 9 plus 5 equals 14...... 14 minus 1 equals 13
1, 5, 2, 6, 3, 7, 4, 8, 5, 9, 6, 10, 7, 11, 8, 12, 9, 13, etc.
1, 5, 9, 13....
To find the pattern, simply look for the difference in the first two numbers, then the following pair of numbers, etc. 2 9 5 13 10 19 17 2 + 7 = 9 9 - 4 = 5 5 + 8 = 13 13 - 3 = 10 10 + 9 = 19 19 - 2 = 17 The pattern is +7, -4, +8, -3, +9, -2...
9 1/16. (1 times 5 is 5, and 13/16 times 5 is 65/16 which is 4 1/16; the 4 adds to the 5 to give 9, and then the 1/16 makes it 9 1/16.)
-17, -21 Pattern is subtract 4.