Question

please answer with explanation​

Answer 1

Adding first two equations we get the third so 2nd option is true

by multiplying c to these equations we get frequency. so 3rd option is true

by multiplying hc these equations we get

energy. So 4th is true

but by adding the reciprocal of first and second equations we don't get the reciprocal of 3rd equations . So option 1 is incorrect.