प्रश्न 1. प्रथम 1000 धनपूर्णांक
का योग ज्ञात कीजिए।
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Answer:
S=5005005
Step-by-step explanation:
S1000=n/2(a+l)
n=1000, a=1, l=1000
=1000/2(1+1000)
500(1001)
5005005
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