CAT Exam

A set consists of ten natural numbers consisting of 8 odd numbers and 2 even nos. find the number of subsets of the set in which there is atleast 1 even number?

Read Solution (Total 2)

ans is 768
one no subset= 2c1
two no subset= 2c2 + 8c1*2c1
three no subset = 8c1*2c2 + 8c2*2c1
likewise for other no subset is calculated
results into
no of subsets=768
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ans:768 is already given
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CAT Other Question

remainder when 32^32^32 is divided by 9 Meera was studying for her examinations and the lights went off. It was around 2:00 AM. She lighted two uniform candles of equal length but one thicker than the other. The thick candle is supposed to last six hours and the thin one three hours. When she finally went to sleep, the thick candle was twice as long as the thin one. For how long did Meera study in candle light?