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How do i solve this : 2^20 – 2^19.
Source: Beat The GMAT — Problem Solving |
Agreed with the above solution. Whenever you get a problem like this, always find a common factor and take it out.
devil backer,
2^20 = 2^19 * 2 that is a common formula for 2^(a+b) = 2^a * 2^b
So what the answer u have got from ri2007 is quite correct. U can also refer some math book where from u can get an idea abt this.
2^20 = 2^19 * 2 that is a common formula for 2^(a+b) = 2^a * 2^b
So what the answer u have got from ri2007 is quite correct. U can also refer some math book where from u can get an idea abt this.
Correct me If I am wrong
Regards,
Amitava
Regards,
Amitava
If u want to verify
2^20 = 2*2^19
i.e 2^19 is half og 2^20
so if 2^19 is subtracted from 2^20 you will get 2^19
2^20 = 2*2^19
i.e 2^19 is half og 2^20
so if 2^19 is subtracted from 2^20 you will get 2^19
Regards
Samir
Samir
