The product of the predecessor and the successor of the greatest 2-digit number is
9900
9800
9700
none of these
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The greatest 2-digit number = 99.
Predecessor of 99 = 99 - 1 = 98.
Successor of 99 = 99 + 1 = 100.
Product of predecessor and successor = 98 × 100 = 9800.
Hence, option 2 is the correct option.
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The predecessor of the smallest 4-digit number is
99
999
1000
1001
The predecessor of 1 million is
9999
99999
999999
1000001
The sum of the successor of the greatest 3-digit number and the predecessor of the smallest 3-digit number is
1100
1101
1099
The number of whole numbers between 22 and 54 is
30
31
32
42