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Maths Puzzle
If a and b are positive integers, and x=2×3×7×a , and y=2×2×8×b , and the values of both x and y lie between 120 and 130 (not including the two), then a–b?
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self Other Question
Find a number consisting of 9 digits in which each of the digits from 1 to 9 appears only once. This number should satisfy the following requirements:
a. The number should be divisible by 9.
b. If the most right digit is removed, the remaining number should be divisible by 8.
c. If then again the most right digit is removed, the remaining number should be divisible by 7.
d. etc. until the last remaining number of one digit which should be divisible by 1.
A jar contains 3 coins. 2 are heads and tails. 1 is heads and heads.
You pick out at coin and toss it 3 times. You get three heads.
Question ; What is the probability of getting a head on the fourth toss ?