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কোন জোড়াটি পরস্পর আইসোবার?

{}_{30}^{64}{Cu}, {}_{29}^{64}{Zn}

{}_{29}^{62}{Cu}, {}_{30}^{63}{Zn}

{}_{29}^{63}{Cu}, {}_{30}^{64}{Zn}

{}_{29}^{64}{Cu}, {}_{30}^{64}{Zn}

ANS : 0

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