Question

There are 10 trains plying between calcutta and delhi. The number of ways in which a person can go from calcutta to delhi and return by a different train is

Answer 1

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ANSWER

90

EXPLANATION

There are 10 trains plying between C and D. if a person used 1st train to go.then there are 9 ways open for returning. hence 10 ways for going × 9 ways for returning=90 ways.

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Answer 2

Answer:

90 ways

Step-by-step explanation:

Given,

The number of trains between Calcutta and Delhi = 10,

Thus, the number of ways by which a person go from Calcutta to Delhi = 10,

If he will not come in the same train,

So, the possible ways of returning from Delhi to Calcutta = 9

Hence, the total way = 10 × 9 = 90