Preeyadarshee's blog

By Preeyadarshee, history, 4 years ago, In English

I am not even able to solve problems which i have solved in the past.I skipped permutation and combination in my high school.Is this problem because of the above mentioned reason or do i need to just practice more problems ? Please help, I did try to find about it on google, but didn't get much info. Also, It will be very helpful if someone can list some nice problems on it. Thanks in advance :)

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