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I dont get this can someone please tell me

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Group A IQ A1 - What's Next ** What could be the NEXT number and why? 1, 4, 7, 11, 15, 18, 21, 24, 27, 73 , ?

IQ A2 - Summation * Complete this sum using all digits 0-9. 2 8 ? + ? ? 4 = ? ? ? ?