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we have, index size =40B(CK)+10B(POINTER)=50 B

blocking factor = 1000/50=20records/block

Number of first level index records =20,000

Number of first level blocks =20000/20=1000blocks

number of second level blocks 1000/20=50blocks

number of third level blocks = 50/20=3blocks

number of fourth level blocks =3/20=1block

so total levels will be 4

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