exam Maths Puzzle Numerical Ability

please help with this promblem:
(2a^b)(ab^3)(-3a)=
thanks.

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exam Other Question

how to remove all symbols of grouping and combinr like terms? Calculate the probability of drawing four cards out of a standard deck.

P(4 of a kind)
P(All the same suit)
P(All the same #)

Thanks So much!