What is the least positive integer that is exactly divisible by all the integers from to ?
1260
2520
5040
720
Hint 1: Understand that the number is the LCM of all numbers from 1 to 10.
Hint 2: Form the LCM by taking the highest power of each prime base appearing in the numbers 1 to 10: , , , and .
Hint 3: Multiply them: , and identify option index 1.
Step 1 (LCM Concept): The least positive integer divisible by all numbers from 1 to 10 is the Least Common Multiple (LCM) of the set .
Step 2 (Calculate the LCM): We factor each number and take the highest power of each prime:
Prime 2: highest power is (from 8)
Prime 3: highest power is (from 9)
Prime 5: highest power is (from 5, 10)
Prime 7: highest power is (from 7)
Step 3 (Conclusion): The least positive integer is 2520, which is at option index 1 in the options ['1260', '2520', '5040', '720'].
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