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STARS AND THE SOLAR SYSTEM
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What is the number of ways of choosing 4 cards from a pack of 52 playing cards ? In how many of these : cards are of the same colour ?
In how many ways can 4 red, 3 yellow and 2 green discs be arranged if the discs of the same colour are indistinguishable ?
A bag contains 4 white and 3 black balls. Two balls are drawn at random. Find the probability that they are of the same colour.
Each of the six squares in the strip shown in the fig., is to be coloured with anyone of ten different colours so that no two adjacent squares have the same colour. Find the number of ways of colouring the strip.
In a drawer there are four white socks, three blue socks and five grey socks. Two socks are picked at random. What is the probability that both the socks are of same colour?
Equal volumes of hydrochlric acid and sodium hydroxide solutions of the same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the same colour obtained?
Do materials alway have the same colour,whether viewed by refrlected light or through transmitted light?
In how many ways can the following diagram be coloured subject to the following conditions ? No two adjacent regions receive the same colour .
In how many ways can 6 beads of same colour form a necklace ?
NAND LAL PUBLICATION-STARS AND THE SOLAR SYSTEM-ADDITIONAL QUESTIONS (SELF PRACTICE PROBLEM )
