The product of successor and predecessor of 999 is

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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
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  1. 999000
  2. 998000
  3. 989000
  4. 1998

Answer (Detailed Solution Below)

Option 2 : 998000
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Bihar STET Paper 1 Mathematics Full Test 1
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Detailed Solution

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Given:

Number = 999

Concept used:

The predecessor of a number is the number that comes immediately before it in the natural number sequence. 

The successor of a number is the number that comes immediately after it in the natural number sequence. 

Calculation:

Successor of 999 = 999 + 1 = 1000

Predecessor of 999 = 999 - 1 = 998

⇒ Product = Successor × Predecessor

⇒ Product = 1000 × 998 = 998,000

∴ The product of the successor and predecessor of 999 is 998,000.

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