Suppose that m and n are two independent works .If ways to do a work m

1.	Suppose that m and n are two independent works .If ways to do a work m is x and number of ways to do a work n is y then number of ways in which both work (m and n ) can be done is xy .x={2,3,4,5,6,7,8,9}y={0,1}z={0,1,2,3,4,5,6,7,8,9}Before 1990, telephone area codes in the United States were three-digit numbers of the form xyz. Shown above are sets X, Y, and Z from which the digits x, y, and z, respectively, were chosen.Q.1 how many possible area codes were there ?Q.2 how many such area codes are possible which have two same digits ( repetitive digit )
Answer» Answer: Suppose that m and n are two independent WORKS . If WAYS to do a work m is x and number of ways to do a work n is y then number of ways in which both work (m and n ) can be done is xy . x={2,3,4,5,6,7,8,9} y={0,1} z={0,1,2,3,4,5,6,7,8,9} Before 1990, telephone AREA codes in the United States were three-digit NUMBERS of the form xyz. SHOWN above are sets X, Y, and Z from which the digits x, y, and z, respectively, were chosen. Q.1 how many possible area codes were there ? Q.2 how many such area codes are possible which have two same digits ( repetitive digit )

Suppose that m and n are two independent works .If ways to do a work m is x and number of ways to do a work n is y then number of ways in which both work (m and n ) can be done is xy .x={2,3,4,5,6,7,8,9}y={0,1}z={0,1,2,3,4,5,6,7,8,9}Before 1990, telephone area codes in the United States were three-digit numbers of the form xyz. Shown above are sets X, Y, and Z from which the digits x, y, and z, respectively, were chosen.Q.1 how many possible area codes were there ?Q.2 how many such area codes are possible which have two same digits ( repetitive digit )

Answer»

Answer:

Suppose that m and n are two independent WORKS .

If WAYS to do a work m is x and number of ways to do a work n is y then number of ways in which both work (m and n ) can be done is xy .

x={2,3,4,5,6,7,8,9}

y={0,1}

z={0,1,2,3,4,5,6,7,8,9}

Before 1990, telephone AREA codes in the United States were three-digit NUMBERS of the form xyz. SHOWN above are sets X, Y, and Z from which the digits x, y, and z, respectively, were chosen.

Q.1 how many possible area codes were there ?

Q.2 how many such area codes are possible which have two same digits ( repetitive digit )

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