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5^C2 + 5^C1 =_______?

5^C2 + 5^C1 =_______?

Explanation
  • The correct answer is: 6^C2

This is because:

  • 5^C2 = 10
  • 5^C1 = 5
  • 10 + 5 = 15

And:

  • 6^C2 = 15
  • So, 5^C2 + 5^C1 = 6^C2.