Question

for what values of n , 2^n × 5 ^n ends with 5 ?

Answer 1

hello@

here is u r answer@

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we have ,

2^n × 5^n

if n =1 then 2 × 5 = 10.

if n = 2 then 2^2 × 5^2 = ( 2 ×5) 2 = 10 ^2 =100 and so on.

thus , for many value of n , we get that 2 ^n × 5 n ends with 5.

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