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Q.

Point out the correct answer for the LCM of the numbers 42, and 63.


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a

126

b

616

c

144

d

62 

answer is A.

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Detailed Solution

The given data is the numbers 42,63.
We shall find the LCM of these numbers; by dividing these numbers by least common multiples until no further division is possible and then multiplying all the divisors which are prime numbers.
3 42,63 7 14,21    2,3 ⇒LCM=2× 3 2 ×7=126  
Hence, the required LCM is 126.
Hence the correct answer is option (1).
 
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