102 square - 98 square solve the question by using identity a square minus b square
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a sq-b sq=a+b*a-b=102+98*102-98=200*4=800
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a2 - b2 = (a + b) (a - b)
=(102+98)(102-98)
=200*4
=800
=(102+98)(102-98)
=200*4
=800
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