1/(1 - p + p ^ 2) - 1/(1 + p + p ^ 2) - (2p)/(1 - p ^ 2 + p ^ 4) ʜᴇʟᴩ ᴍᴇ ꜰᴀꜱᴛ

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

The nth term of a sequence in 2n-1 the nth term of a different sequence is 3n+1 work out 3 numbers that are in bothe sequences and are between 20 and 40

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.