Complete the sequence 9,10,11,13,15, __, 21,28.



Complete the sequence 9,10,11,13,15, __, 21,28...

Answer / udit chopra

its an alternate series
9+2=11 10+3 = 13
11+4=15 13+6 = *19*ans
15+6= 21 19+9 = 28

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