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The average of a1, a2, a3, a4 is 16. Hal...

The average of `a_1, a_2, a_3, a_4` is 16. Half of the sum of `a_2, a_3, a_4` is 23. What is the value of `a_1`

A

(a) 18

B

(b) 21

C

(c) 26

D

(d) 31

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The correct Answer is:
C
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