It is: 128 by doubling the numbers each time
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128. 1+1=2 2+2=4 4+4= 16 16+16= 32 32+32= 64 64+64 = 128 128+128 = 256 256+256 =512 512+512= 1024 Each time take the answer from the previous problem and double it to find the next number in the sequence.
1. Each number is 1/2 of previous number.
64 4*16 = 64 2*32 = 64 1*64 = 64
The GCF is 16.
-64