Show that 3412 2565 7246 5579 is an invalid American Express credit card number.

there is to many digits, an American Express card has only 15 digits while this card has 16.

Step-by-step explanation:

Each brand starts with a specific number:

Each brand has a specific number of digits in the card number:

The security code number (CVV or CVV2) for each card types are:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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