Question

3. For which of the numbers, from n - 2 to 8, is 2n-1 a prime?​

Answer 1

Answer:

for n=2,3,4,6,7

Step-by-step explanation:

for n=2

2(2)-1=4-1=3(prime)

for n=3

2(3)-1=6-1=5(prime)

for n=4

2(4)-1=8-1=7(prime)

for n=5

2(5)-1=10-1=9(composite)

n=6

2(6)-1=12-1=11(prime)

n=7

2(7)-1=14-1=13(prime)

n=8

2(8)-1=16-1=15(composite)

Answer 2

7td5rvyx3x8h td ug 8y9u