Multiple Choice Questions

Find the least number of six digits which is exactly divisible by 15 21 and 28 ........

Elelmentary Mathematics (UPPCS) LCM, HCF

Find the least number of six digits which is exactly divisible by 15, 21 and 28.

100480

100270

100380

100340

L.C.M of 15,21 and 28 = 420

The smallest 6 digits number is 100000.

Now find the multiple of 420 close to 100000.

=> 420*238 = 99960. But this is a 5 digit number.

Add 420 to it so that it can become a 6 digit number and will be divisible by 420.

Required Number = 99960 + 420 = 100380

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