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Question

The generation in a family tree has 128 members.

A
fifth
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B
seventh
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C
eighth
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Solution

The correct option is B seventh
The number of members in each generation in a family tree is double the number of members in the previous generation.

So, starting from current generation with 1 member,
First generation =1×2=2 members

Second generation =2×2=4 members

Third generation =4×2=8 members

Fourth generation =8×2=16 members

Fifth generation =16×2=32 members

Sixth generation =32×2=64 members

Seventh generation =64×2=128 members

Therefore, the seventh generation of a family tree has 128 members.

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