2 2. 100 और 200 के बीच सभी प्राकृतिक संख्याओं का योग ज्ञात कीजिए, जो 7 से विभाज्य हैं।
(A) 1320 (B) 1280 (C) 1200 (D) 1300
उत्तर है: (C)
चरण-दर-चरण समाधान:
100 और 200 के बीच 7 के गुणनखंडों की संख्या = (196 - 105)/7 + 1 = 14 इन संख्याओं का योग = 7*10 = 70 100 7 से विभाज्य नहीं है, लेकिन 200 नहीं है। इसलिए, उत्तर 70 - 100 = -30 है।
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