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ABCD a parallelogram, and `A_1 and B_1` are the midpoints of sides BC and CD, respectively. If `vec(A A)_1` `+ vec(AB)_1 = lamda vec(AC)`, then `lamda` is equal to `

A

`1//2`

B

1

C

`3//2`

D

2

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The correct Answer is:
C
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