1,6,21,42,69..
complete the series....
dolly6437:
it's question is very hard
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hey listen ...
★in between 6 to 21difference is 5 times of 3
★in second difference is 7 times of 3
★in third difference is 9 times of 3
★so it is clear that there is a difference of odd no 3 times..
therefore 69+ 11*3=102
don't want brainliest
=_=
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