Question

A number is less than 50.It is a multiple of 7 and it has 3 prime factors. what is that number? a)14 b)42 c)49 ď)35

Answer 1

In these options, 42 is the only number which is so possible.

42 - 1 X 42
     - 2 X 21
     - 3 X 14
     - 6 X 7
Here, 2, 3 & 7 are the only three prime factors
Hence the option is C.

Answer 2

the answer is 49 because

step by step ::

write 7 table

7

14

21

28

35

42

49

56

63

and 70

so the main step is finding .. find the 3 prime factors number ....

yes so 42

1×42

2×21

3×14

6×7

hope it is helpful