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No, 4/3 and 4.5 are not correct.

I think its C(29, 10)

Number of non-negative solutions for the eq.

a1 + a2 + a3 + ... + a20 = 10

where a1, a2, a3, .., a20 are number of books corresponding to the twenty best selelrs

It will be C(29,19). (n+r-1)C(r-1)

Here r is 20 and n is 10.

himanshushah20 SaysIn that case the answer should be 0.What say??

If we see it this way.

17+23 =40 and 19+21=40.

So

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answer for que 1 is 31

are the options correct for que 2?? i am getting an answer of 12 which is not in the options.

i guess there is something missed out in que.

Answer for second is 12

For the first one, we need to start from last number and eliminate the numbers from set so that they do not add to 380.

For 373 we can have all numbers except 7.For 367 all except 13 and so on.

This way we are removing half the numbers . hence we can have maximum of 31 numbers in the set.

Cloak SaysI think thre is some data missing or error in question....

Even if copper and tin do not add up to 100% still the question can be solved since we have been given the amount of tin in the final mixture from which we can find out the weight of the two alloys mixed and the weight of copper in the final mixture.

amitshanky SaysIn a 100m race, Sujit beats rishi by 5m and rishi beats praveen by 5m. By what distance does sujit beat praveen??

9.75 meters.

Ss/Sr = 100/95

Sr/Sp=100/95

So

Ss/Sp=400/361

So for 100 meter race, when Sujeet completes 100m Previn completes 90.25m

2. suspicion

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amitshanky SaysOne alloy of metal contains 90% copper and 10% tin. Another alloy contains 93% copper and 4% tin if they are mixed so that mixture may contain 9% tin then what % of copper it will contain ?

Let first alloy be xkg and second alloy be y kg.

So we have

.1x+.04y=.09(x+y)

=> x=5y

For percentage of copper

(.9x+.93y)/(x+y)*100

Put x=5y and solve.

2. a clear broth made by dissolving a commercially prepared bouillon cube in hot water

2. (adj.) accomplished gradually

3. (adv.) into pieces or fragments

4.(adv.) piece by piece or one piece at a time

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