Answer :
We know,
Probability of an event 
a. Total cards from 3 and 50 = 50 – 3 + 1 = 48
Cards having number divisible by 7 = {7, 14, 21, 28, 35, 42, 49} = 7
Probability (Number is divisible by 7) 
b. Total cards from 3 and 50 = 50 – 3 + 1 = 48
Cards having a perfect square = {4, 9, 16, 25, 36, 49} = 6
Probability (Number is perfect square) 
c. Total cards from 3 and 50 = 50 – 3 + 1 = 48
Cards having number multiple of 6 = {6, 12, 18, 24, 30, 36, 42, 48} = 8
Probability (Number is multiple of 6) 
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