A girl wanted to calculate the sum of two numbers stored as a and b multiplied by 7. Select the appropriate Java expression.

1. a + b*7
2. 7*a + b
3. (a + b)*7
4. a + 7*b

The sum of a[1] and a[3] in the array int a[] = {20, 40, 60, 80, 100} is:

1. 80
2. 100
3. 120
4. 60

The AMB hotel gives the amount to be paid by the customer as an integer, which of the following Math method rounds off the bill in decimals to an integer?

1. Math.round()
2. Math.pow()
3. Math.ceil()
4. Math.abs()

Identify which of the following leads to an infinite loop.

1. for(i = 10; i != 0; i--)
2. for(i = 3; i <= 30; i += 3)
3. for(i = 1; i >= 1; i++)
4. for(i = 1; i >= 0; i--)