Question

If m, n are natural numbers, for what values of m, does 2 5 n m ´ ends in 5?

Answer 1

Answer:

Values of m can be  1 , 3 , 5 , 7 & 9

Step-by-step explanation:

If m, n are natural numbers, for what values of m, does 2 5 n m ´ ends in 5?

25nm  will end in 5  iff

nm  ends with Odd number (1 , 3 , 5 , 7 , 9)

nm to end with odd number it is necessary that

n & m both are odd numbers

So Values of m can be  1 , 3 , 5 , 7 & 9

but condition is that n also should be odd number

Answer 2

Answer:

No value of m will satisfy 2n x 5m ends in 5

Step-by-step explanation:

2n x 5m 2n is always even for all values of n.

5m is always odd and ends with 5 for all values of m.

But 2n x 5m is always even and ends in 0.

∴ 2n x 5m cannot end with the digit 5 for any values of m.

No value of m will satisfy 2n x 5m ends in 5.

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