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Solution:
⇨ First choose the largest number among the given number and write it equal to the product of smaller number.
⇨ Here largest number is 225
⇨ Here largest number is 225
⇨ 225=135 x 1 + 90
⇨ 135=90 x 1 + 45
⇨ 90=45 x 2 + 0
⇨ When Reminder becomes zero then last multiple with the prime number will be our HCF.
⇨HCF (135,225) = 45