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Option 4 : All are true
Statement I:
⇒ Positive factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Total factors = 12
∴ Statement I is true
Statement II:
We know that sum of first n odd numbers = n2
⇒ Sum of first 20 odd numbers = 202 = 400
∴ Statement II is also true.
Statement III:
Largest two digit prime number is 97
∴ Statement III is also true
∴ All Statements are true.
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