which number will replace question mark in the series 1,3,10, 24,64,129,?,777
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1,3,10,24,64,129?,777 the? =260
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3=3
10=1+0=1
21=2+1=3
64=6+4=10=1+0=1
129=1+2+9=12=1+2=3
260=2+6+0=8=( wrong one.. it should be 1)
777=7+7+7=21=2+1=3