Evaluate: 7+9+5+4 in the order specified...

Evaluate: `7+9+5+4` in the order specified:
a. add the first two terms, add the last two terms and then add the two sums thus obtained.
b. add the second and third term, add this sum to the last term, and then add first term and the sum obtained.
c. add the first two terms, add this sum and third term, and then, add this sum and fourth term.

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The correct Answer is:

a. 25 b. 25 c. 25

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