Question & Answer: Page 1

Piku pattnayak asks : Find the missing number from the given question 173 (24) 526 431 (18) 325 253 ( ? ) 471 Please help me to find answer it is a previous year ssc question?

Tag : previous,year,answer,question,number,reasoning,miing

Category : Reasoning | On : 2012-05-23 08:46:41

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Anilbondkumar asks : . Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?

Tag : reasoning,series,number

Category : Reasoning | On : 2012-05-17 06:45:38

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G.swetha says :

17/05/2012 10:21:59

1/8

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Nibha gupta asks : An eight digit number divisible by 9 is to be formed by using 8 digits out of the digits 0, 1, …, 9 without replacement. The number of ways in which this can be done is a- 9! b- 2(7!) c- 4(7!) d-36(7!) plz exlain with sol

Tag : divisible,number,replacement,digit,exlain,digits,formed,ways

Category : NIMCET (NIT) | On : 2012-05-15 11:57:46

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Arnab sen says :

16/05/2012 04:28:45

The answer is D-36(7!).. :-) Explanation: First the sum of the 10 digits (0,1,...,9) is 45,which is divisible by 9.So we have to wisely remove 2 digits from here so that the sum remains divisible by 9. now 5 combination of such 2 digits are possible ie. (0,9),(1,8),(2,7),(3,6) and (4,5).for (0,9) combination the permutation of rest 8 digits are 8!.For each of rest 4 combinations the possible combination 8 digits numbers is=(8!-7!)as we removing the case where 0 is the leading digit.. so total possible combinations is: 8!+4*(8!-7!) =(8*7!)+4*7!(8-1) =(8*7!)+28*7! =(8+28)*7! =36(7!)(required ans..) Hope it was helpful......

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Shashank mishra asks : : Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture? 1.In alkali metals the reactivity increases, but in the halogens it decreases with increase in atomic number down the group. 2.The reactivity decreases in the alkali metals, but increases in the halogens with increase in atomic number down the group. 3.In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group. 4.Chemical reactivity increases with incr