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The smallest number when increased by " 1 " is exactly divisible by 12, 18, 24, 32 and 40 is__________?

Correct answer: A. 1439

  • A. 1439
  • B. 1440
  • C. 1459
  • D. 1449Pakistan Studies Quiz

Explanation

If the number increased by 1 is divisible by all the given numbers, first find their LCM: LCM(12, 18, 24, 32, 40) = 1440. Therefore the required number is 1440 - 1 = 1439. The likely mistake is option b, 1440, which is the divisible number after the increase, not the original number.

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