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प्रश्न
Find the value of `(1/2)^(-2)+(1/3)^(-2)+(1/4)^(-2)`
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उत्तर
`(1/2)^(-2)+(1/3)^(-2)+(1/4)^(-2)`
= `(2/1)^(2)+(3/1)^(2)+(4/1)^(2)` `(thereforea^(-m)=1/a^m)`
= 22 + 32 + 42
= 4 + 9 + 16
= 29
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1256.249
