The value of
Question:

The value of 2492 – 2482 is

(a) 12        (b) 477           (c) 487           (d) 497

Solution:

(d) Now, 2492 – 2482 = (249 + 248) (249 – 248) [using identity, a2 – b2 = (a – b)(a + b)]

= 497 x 1 = 497.

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