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Solution:

\r\n

Numbers divisible by 3 from 1 to 50:

\r\n

= 16

\r\n

Numbers not divisible by 3:

\r\n

= 34

\r\n

Total ways:

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50C2 = 1225

\r\n

Ways product is NOT divisible by 3:
34C2 = 561

\r\n

Required ways:

\r\n

1225 − 561 = 664

\r\n

Probability:

\r\n

664/1225

\r\n

Answer: 664/1225

"}}]}]]}]

Two distinct numbers a and b are selected randomly from 1 to 50. Find probability that ab is divisible by 3.

Verified Answer