Question

f=21 power(203)+24power(203) they asked which of the following is not a factor of f? 3,6,9,15 and 45

Answer 1

\[f=21^{203}+24^{203}\]
\[f=(3*7)^{203}+(3*8)^{203}\]
\[f=3^{203}*7^{203}+3^{203}*8^{203}\]
\[f=3^{203}*(7^{203}+8^{203})\]
\[f=odd*(odd+even) = odd*odd = odd\]
6 is even