Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 There are 16 address lines
 It facilitates the user storing 16-bit data temporarily
 It has to fetch two 8-bit data at a time
 It counts 16-bits at a time

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Microprocessor
Assertion (A): Negative values of incremental operator in DO loop are allowed in Fortran 77 but not in earlier versions of Fortran. Reason (R): Fortran 77 has better array facilities than earlier versions of Fortran.

Both A and R are correct but R is not correct explanation of A
A is wrong R is correct
Both A and R are correct and R is correct explanation of A
A is correct R is wrong

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