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Six identical coins are arranged in a ro...

Six identical coins are arranged in a row. The total number of ways in which the number of heads is equal to the number of tails is

A

35

B

15

C

140

D

70

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The correct Answer is:
D
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2nd idetical coins are arrangeed in a row and the number of ways in which the number of heads is equal to the nuber of tails is 70, then n= (A) 4 (B) 5 (C) 3 (D) none of these

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In an auditorium, seats are arranged in rows and columns. The number of rows were equal to the number of seats in each row. When the number of rows were doubled and the number of seats in each row was reduced by 10, the total number of seats increased by 300. How many number of seats are there in the auditorium after re-arrangement.

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In an auditorium, seats are arranged in rows and columns. The number of rows were equal to the number of seats in each row. When the number of rows were doubled and the number of seats in each row was reduced by 10, the total number of seats increased by 300. If x is taken as number of row in original arrangement which of the following quadratic equation describe the situation ?

In an auditorium, seats are arranged in rows was equal to the number of seats in each row. When the number of rows was doubled and the number of seats in each row was reduced by 10, the total number of seats increased by 300. Find the number of rows in original arrangement.

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