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The probability of A speaks truth 4/5 while B is 3/4. The probability that they contradict each other when asked to speak on a fact is

The probability of A speaks truth 4/5 while B is 3/4. The probability that they contradict each other when asked to speak on a fact is
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Find the last two digits of : 15*37*63*51*97*17

Find the last two digits of : 15*37*63*51*97*17
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There is a 7-digit telephone number with all different digits. If the digit at extreme right and extreme left are 5 and 6 respectively, find how many such telephone numbers are possible?

There is a 7-digit telephone number with all different digits. If the digit at extreme right and extreme left are 5 and 6 respectively, find how many such telephone numbers are possible?
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Due to a 25% price hike in the price of rice, a person is able to purchase 20 kg less of rice for Rs. 400. Find the initial price.

Due to a 25% price hike in the price of rice, a person is able to purchase 20 kg less of rice for Rs. 400. Find the initial price.                                            
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