Question: Can somebody please help me understand this? My combinatoric professor assigned this question 5. Numerically conrm that 200 + 200 _ 201 49 an _

Can somebody please help me understand this?

My combinatoric professor assigned this question

5. Numerically conrm that 200 + 200 _ 201 49 an _ 50 ' (Hint: Do not try to expand 200!; it is a perfect good number written in this form.) Sol we know that ner = n ! a! ( n - r ) !, SO 200 Lug + 200 ( 50 200 1 200 ! 49! ( 200 - 49 ) ! 50! (200- 50 ) ! = 200 ! what did 7 49 ! ( 151 ) ! 50 ! ( 150 ) ! he do = 200!5 50 in 50 / x 49: ( 151 )! 50! $ 151 (150 )! } here 50 + 151 = 200! T 501 151 ! (200 ! ) x 201 50 1 151! 201 ! 50 ! ( 201- 50 ) ! 201 ( go Ars

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