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Actually, I think this is easy one you can also calculate simply.
let us look what is the always end term if n is a natural no. then 6^n - 5^n ends with ??? we don't know .
As you know natural no. means. 1 , 2 , 3, 4, 5, 6...
so on infinity.
in condition (1 )
then, 6^n - 5^n = 6^1 - 5^1 = 6 -5 = 1
in condition (2)
6^n - 5^n = 6^2 - 5^2 = 36 - 25 = 11
in 3rd condition
6^n - 5^n = 6^3 - 5^3 = 216 - 125 = 91
⚠ in these three condition we saw in the end term 1 is unit digit and that's why all term is end with 1
Since option a ) 1 is correct option .
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Hope it doesn't help you !!!☺
@Rajukumar111