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please show all steps, thanks

1. Find an explicit expression for P20). You may wish to involve the generating function ſz, h) and make use of the binomial
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Page Ans A& joren AlxA)e JI-axh th Let us toke IX0 then Ithi Now toke binomiaf expansion f (ItE) Ith2 22n 7-1 27 T .3. 5 On-)theore an -3 lo)h 27 (-1) othenwise. for n=2K for even For oddAnea Date Page for l-a for le4 ( 3.1 4 (-1) (4-1)11 3 8 for le6 6-1)11 C-1) -6.५. २ 67 +6ASD Date Page plo)= 3K 35x4-30x+3) fylD) = 3I0 f&lo) = -S 31x6-315x7 26 16 t/o 5x-5 Results ore vefied fe ,4.and 6

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