Seventy Four (74)
1. The maximal number of regions into which a plane can be divided by 9 circles are 74.
2. It is the product of two distinct prime.
74 = 2 x 37
3. It is the sum of four consecutive numbers.
74 = 17 + 18 + 19 + 20
4. The atomic number of Tungsten is 74.
Regards
Dr Rajesh Kumar Thakur
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