Find 249*251 without actual multipication.
ankit292:
250 square minus 1 square
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249 × 251
= (250 - 1)(250+1)
= (250)^2 - (1)^2 [ (a+b)(a-b) = a^2 - b^2]
= 62500 - 1
= 62499
= (250 - 1)(250+1)
= (250)^2 - (1)^2 [ (a+b)(a-b) = a^2 - b^2]
= 62500 - 1
= 62499
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