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Question
The value of 2492 – 2482 is ______.
Options
12
477
487
497
Solution
The value of 2492 – 2482 is 497.
Explanation:
Consider the expression:
2492 – 2482
Use the identity: a2 – b2 = (a + b)(a – b)
2492 – 2482 = (249 + 248)(249 – 248)
= 497 × 1
= 497
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