Q. 155.0( 1 Vote )

# If 5 A × A = 399,

Answer :

According to the question A x A = 9

The one’s place in the product of A and A is 9

A is the number whose multiplication with itself gives a two digit number having 9 in it’s one’s place.

Hence A = 7 because A x A = 49 and one’s place of 49 is 9

Option (c) is correct.

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