Biology · Human Physiology
यह मानते हुए कि एक बार रक्तदान करने से तीन लोगों की जान बचाई जा सकती है, एक व्यक्ति को बारह लोगों की जान बचाने के लिए वर्ष में कितनी बार रक्तदान करना होगा?
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