1.

21^10 - 4^10 is divisible by

Answer» HEYA !!!!



here is CONCEPT of this question !!!


read carefully !!



21 {}^{10} - 4{}^{10}


is in the form of :- a²ⁿ - b²ⁿ

which is both dividable by a - b

and a + b




so ,


21 {}^{10} - 4 {}^{10}

is dividable by both

21 + 4 = 25.


and

21 -4 = 17



hence according to question. !! your answer is
option number "C "



hope it helps you dear !!


THANKS !!!



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