plz urgent

Asked by shrbha | 18th May, 2010, 10:08: PM

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  | 19th May, 2010, 09:41: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.