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**Hint:**To convert a number from one unit to another, we have to multiply it by a factor. To solve this question, we must know that 1 crore is equal to 100 lakh and 10 lakh is equal to 1 million. Using this information, we can solve this question.

**Complete step-by-step answer:**

Before proceeding with the question, we must know how to convert a million and a crore into lakh.

One million is equal to ten lakh. Mathematically, we can write it as,

1 million = 10 lakh . . . . . . . . . . . . . . . . . (1)

Also, one crore is equal to hundred lakh. Mathematically, we can write it as,

1 crore = 100 lakh . . . . . . . . . . . . . . . . . . . . . (2)

In this question, we are required to find the number of million in one crore. For that, we have to convert a crore into a million.

From equation (1), we have 1 million = 10 lakh. If we multiply this equation by 10 on both sides, we can say that 10 million = 100 lakh. Also, from equation (2), we have 100 lakh = 1 crore. Hence, we can say that,

1 crore = 10 million.

So, we have 10 million in one crore.

Hence, the answer is option (a).

**Note:**This is an easy question which can be done only with the basic knowledge of how to convert million and crore to lakh. So, the possibility of mistake is only when one has the incorrect knowledge of how to convert million and crore to lakh.

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