Given \(a \equiv 1 \pmod{7}, b \equiv 2 \pmod{7}\) , and \(c \equiv 6 \pmod{7}\), what is the remainder when \(a^{81} b^{91} c^{27}\) is divided by 7?
a =8, b=9, c=13
{8^81.9^91.13^27} mod 7 = 5 Remainder.
