Correct Answer - Option 2 : 221
Concept used :-
Trick to multiply two numbers between 10 and 20.
Method :-
- Add the unit digit of the smaller number to the larger number.
- Then, multiply the result by 10.
- Now, multiply the unit digits of both the 2-digit numbers.
- Then add both the numbers.
Calculation :-
Step 1 & 2:- (17 + 3) × 10 = 200
Step 3:- 7 × 3 = 21
Step 4:- 200 + 21 = 221
This is our final answer.
