Question
Study the following information carefully and answer the given questions:(i) There are five types of cards viz, A, B, C, D and E. There are three cards of each type. These are to be inserted in envelopes of three colours --- red, yellow and brown. There are five envelops of each colour.(ii) B, D and E type cards are to be inserted in red envelopes; A, B and C type cards are to be inserted in yellow envelopes; and C, D and E type care are to be inserted in brown envelopes.(iii) Two cards each of B and D type are inserted in red envelopes.How many cards of E type are inserted in brown envelopes?
Answer: Option C
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From (ii), out of fifteen cards nine cards can be inserted easily. 
From (iii) and using the above table, we get 
The digits in brackets shows the number of cards. Now, from (i), it is clear that each colour of envelope contains five cards, so there are two cards of C-type in brown envelope. Hence the remaining one card of C-type is in yellow envelope. Hence all the three A-type cards are in yellow envelope.
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