ssume that a website allows only lower case letters for password required to havea length of size 5, but does not allow the following choices for the password: (1)all 5 characters are identical and (2) any sequence ending with "gk". If a 5 lettersequence is randomly selected, what is the probability that it is a valid password?

i can't see the picture : /

the answer is a if my teacher taught me correct

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: