CUET Preparation Today
CUET
-- Applied Mathematics - Section B2
Numbers, Quantification and Numerical Applications
The number at unit place of number $17^{23}$ is :
1
3
7
9
The correct answer is Option (2) → 3
$7^1=7$
$7^2=49$
$7^3=343$
$7^4=2401$
$⇒(17^4)^5×(17)^3$
⇒ (Last digit 1) × (Last digit 3)
$=3$
