1/2^10+1/2^11+1/2^12+1/2^12=?
1) 1/2^7
2) 1/2^8
3) 1/2^9
4) 1/2^13
5) 1/2^45
OA is C
exponents
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1/2^10 + 1/2^11 + 1/2^12 + 1/2^12grandh01 wrote:1/2^10+1/2^11+1/2^12+1/2^12=?
1) 1/2^7
2) 1/2^8
3) 1/2^9
4) 1/2^13
5) 1/2^45
OA is C
= 1/2^10(1 + 1/2 + 1/2² + 1/2²)
= 1/2^10(1 + 1/2 + 1/4 + 1/4)
= 1/2^10(1 + 1/2 + 1/2)
= 1/2^10(1 + 1)
= 2/2^10
= [spoiler]1/2^9[/spoiler]
The correct answer is C.
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