1. 20 से 120 के बीच ऐसी कितनी संख्याएँ हैं जिन्हें 9 से भाग दिया
जा सके?
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Answer:
first no division by 9 is 18
before 120 division by 9 is 117
117 = 18+(n-1)×9
117-18 = (n-1)×9
99 = (n-1)×9
99/9 = n-1
n-1 = 11
n = 11+1
n = 12;
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