Question

For what value of n,2nx5n ends in 5

Answer 1

Hey mate. ..

Let us take 2n × 5 n = 5.....which ends with 5

Therefore 10n^2 = 5
So n = 1 / root 2 .

2 ( 1 / root 2 ) × 5 ( 1 / root 2 )
= 2 / root 2 × 5 / root 2
= root 2 × 5 / root 2

= 5 ..

Answer 2

Answer:

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