How to remove permanent hardness of water.
Options were heating and sodium hexametaphoshate and 2 other
I got 13,2,36,4
Sodium hexametaphospate is the answer
except 1st one all are matching .
for 1st one I got 7
Can you tell for the 4th question
What was the interval specified for the 1st one?
I think it was 19
It was 13.
As all roots of the form npi/3 are repeating & it asked for solutions.
Got all same.
Same approach but how 13
The thirteen solutions are of the form npi/6, 'n' from 0 to 12.
Can u explain 4th one. How much are you expecting@Abhishek_2020_5
13 solutions is correct
For 4th M=2
Can you give reason for the fourth one.