solve this question in 5 secs and enjoy 98 x 98 = 9604 take 100-98 = 02 and square of it is 04 and 98-02 = 96 then

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Ramesh S

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98* 98 (98 is near to hundred) so 100 -98 =2 98 -02 = 96 add two zeros at end=> 9600 square of 2 is 4. Add 04 to the 9600. we get 9604
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square of 96 is 9216
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SIMPLE, 98*98 98*8 = 784 98*9 =(+) 882* = 9604
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(a - b) x (a - b ) = a . a - 2 . a . b + b . b ( 100 - 2 ) x ( 100 - 2 ) = 100 x 100 - 2 x 100 x 2 + 2 x 2 10,000 - 400 + 4 = 9604
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(a - b) x (a - b ) = a . a - 2 . a . b + b . b ( 100 - 2 ) x ( 100 - 2 ) = 100 x 100 - 2 x 100 x 2 + 2 x 2 10,000 - 400 + 4 = 9604
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Ugc net coaching

100-2=98 square of is 4 and 98-2=96 so answer comes this way 9604
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98* 98 (98 is near to hundred) so 100 -98 =2 98 -02 = 96 add two zeros at end=> 9600 square of 2 is 4. Add 04 to the 9600. we get 9604
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