MCQ
The remainder, when $(15^{23} + 23^{23})$ is divided by $19$, is
- A$4$
- B$15$
- ✓$0$
- D$18$
✓
Answer
Correct option: C.
$0$
c
$E = (19 - 4)^{23} + (19 + 4)^{23}$
$E = (19 - 4)^{23} + (19 + 4)^{23}$
$= 2 [19^{23} + ^{23}C_2 · 19^{21} · 4^2 + .......... + ^{23}C_{22} · 19 · 4^{22}]$
$= 2 · 19 [19^{22} + ^{23}C_2 · 19^{20} · 4^2 + .........+ ^{23}C_{22} · 4^{22}]$
$\Rightarrow E$ is divisible by $19 \Rightarrow$ Remainder $= 0$
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