Supposed 5 fair coins are tossed. use pascal’s triangle to find the number of ways of obtaining exactly 4 heads.

answer: 21 ways

step-by-step explanation:

here is the 21 ways from the triangle

1. tt

2. tht

3. htt

4. thhthhh

5. hththhh

6. hhtthhh

7. thhhthh

8. hthhthh

9. hhththh

10. hhhtthh

11. tth

12. hthhhth

13. hhthhth

14. hhhthth

15. tth

16. tt

17. htt

18. hhthhht

19. hhhthht

20. tht

21. tt

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.