Step-by-step explanation:
I think it would be c if not D
S1 = 72
S2 = 12 = 72*(1/6)
S3 = 2 = 72*(1/6)^2
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S15 = 72*(1/6)^14 = 9.18*10^(-10)
January 12 because he will be on his 4th day of push ups and his 3rd day of situps
Step-by-step explanation:
