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`{:("Column A",,,,"Column B"),(21.(2^10/(2^(-10))),,,(a),1),(22. 6^18,,,(b),0),(23. "If "2^x=16."then "x,,,(c),(6^10)^8),(24. 5^@-6^@,,,(d),2^20),(,,,

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`{:("Column A",,,,"Column B"),(21.(2^10/(2^(-10))),,,(a),1),(22. 6^18,,,(b),0),(23. "If "2^x=16."then "x,,,(c),(6^10)^8),(24. 5^@-6^@,,,(d),2^20),(,,,(e),4),(,,,(f),2^18xx3^18):}`
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Correct Answer - D
`to (d): (2^10)/(2^(-10))=2^10xx2^10=2^20`
`to (f) :6^18=(2xx3)^18=2^18xx3^18`
`to(e): 2^x=16rArr2^x=2^4rArrx=4`
`to (b): 5^@-6^@=1-1=0`
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