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Q.

Find the LCM of $1, 2, 3, a n d 5$ .

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a

$30$

b

$40$

c

$20$

d

$10$

answer is C.

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Detailed Solution

As per the question, we have to find LCM which is the least common multiple,

The given numbers $1, 2, 3, a n d 5$ are all prime numbers.

Therefore, the least common multiple is

$1 \times 2 \times 3 \times 5 = 30$

Hence, option C is the correct answer.

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