5,6,9,15,?,40 a)25 b)33 c)27 d)21

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logic : upper number + x where x=1 x=x+y where y=2,3,4... 5--> 5 6--> 5+(1) 9-->6+(1+2) 15-->9+(3+3) x=15=15+(6+4) 25+(10+5)-->40 the required answer is 25

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