if 3 and -3 are the solution of equation ax2+ bx-9=0 find the value of a and b.
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Apiggy bank contains hundred 50p coins, fifty 1 coins, twenty 2 coins and ten coins. If it is equally likely that one of the coins will fall out when the bank is turned upside down, what is the probability that the coin (1) will be a 50 p coin (ii) will not be 1 not5 coin?
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