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Asked by shrbha 18th May 2010, 10:08 PM
Answered by Expert
Answer:

d/13

1,3,3,6,7,9,...,12,21 can be composed from two different sequences,

1/ 1, 3, 7, ... where we are adding 2, 4, 6, 8, to the previous number to get next number.

2/ 3, 6, 9, ... where we are having multiples of 3.

Now, adjusting the second sequence in first, where second sequence elements are denoted boldface.

1, 3, 3, 6, 7, 9, 13, 12, 21.

Regards,

Team,

TopperLearning.

Answered by Expert 19th May 2010, 9:41 PM
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