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हृदय की दो धड़कनो के बीच समयान्तराल 0.8 सेकण्ड है | मनुष्य का औसत जीवनकाल 60 वर्ष मानकर ज्ञात कीजिये कि एक स्वस्थ मनुष्य का हृदय उसके जीवन काल में औसतन कितनी बार धड़कता है ?

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मनुष्य का औसत जीवनकाल = 60 वर्ष
` = 60 xx 365 xx 24 xx 60 xx 60 ` सेकण्ड
` = 1.89 xx 10 ^(9) ` सेकण्ड
दो धड़कनो के बीच समयान्तराल = 0.8 सेकण्ड
` therefore ` अतः मनुष्य के औसत जीवनकाल में धड़कनो की संख्या
` = ( 1.89 xx 10 ^(9))/(0.8) = 2.3625 xx 10 ^(9) `

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