How many numbers between 500 to 900 are divisible by 7 and 9?
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A = | (900-500)/7 | = | 400/7 | = 57
B = | (900-500)/9 | = | 400/9 | = 44
A∩B = |400/63| = 6
=> A∪B = |A| + |B| - |A∩B|
=> A∪B = 57 + 44 - 6 = 95
.'. 95 no.s are divided by 7 and 9 b/w 500 and 900
B = | (900-500)/9 | = | 400/9 | = 44
A∩B = |400/63| = 6
=> A∪B = |A| + |B| - |A∩B|
=> A∪B = 57 + 44 - 6 = 95
.'. 95 no.s are divided by 7 and 9 b/w 500 and 900
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