How many two-digit, positive integers can be formed from the digits 1, 3, 5, and 9, if no digit is repeated?
1 answer:
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Answer:
Step-by-step explanation:
Before adding we require the fractions to have a common denominator
The lowest common denominator of 2, 5 and 3 is 30, thus
+
+
= +
+
Add the numerators leaving the denominator
= =