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Q.

Let a sequence of integers  a1,a2,a3,....... be defined by a1=1,a2=2,a3=3,a4=7,a5=43...... and in general  an+1=1+a1a2a3...an  n1.
If Sn=1a1+1a2+1a3+....+1an  and Pn=1a1a2a3...an, then the value of S2024+P2024 is ___

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answer is 2.

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Detailed Solution

PnPn+1=1a1a2....an1a1a2....an+1=an+11a1a2.....an+1

=a1a2......ana1a2.......anan+1(an+1=1+a1a2....an)

=1an+1 and Sn+1Sn=1an+1

Sn+1Sn=PnPn+1

Sn+1+Pn+1=Sn+Pn

S2019+P2019=S2018+P2018=.....=S1+P1=1a1+1a1=1+1=2

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