27-5

[magical cook]

Hi, Can anyone help? thanks!

[jaspreet.sharma]

Hi, Can anyone help? thanks!

Answer should be A

1 implies x=4n+2
for n=0
x=2

3^x+1 =10.....remainder is 0 when divided by 10

for n=1
x=6

3^x+1= 729+1=730 ....again.........remainder is 0 when divided by 10


2nd stmt implies x>4....is not sufficient.....as if x=5
then
3^x+1=244 and remainder is not 0 when divided by 10

but for x=6.....remainder is 0 when divided by 10

So, just A is sufficient.....

Correct me if am wrong

[magical cook]

you're correct - thanks!