I believe the answer would be B, good luck
Since we are trying to find the number of sequences can be made <em>without repetition</em>, we are going to use a combination.
The formula for combinations is:
is the total number of elements in the set
is the number of those elements you are desiring
Since there are 10 total digits, 
in this scenario. Since we are choosing 6 digits of the 10 for our sequence, 
in this scenario. Thus, we are trying to find 
. This can be found as shown:
There are 210 total combinations.
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If Sarah is saving to buy a new phone. She needs $150, and she has already saved $63 then the equation should be $63 + x = $150
Like what u need help with
