Multiple Choice
Many great mathematicians make their contributions to their field when they are in their __________, a period in which many people excel in terms of __________ intelligence.
A) 20s or early 30s; fluid
B) 50s or early 60s; crystallized
C) 20 or early 30s; crystallized
D) 50s or early 60s; fluid
E) late 30s; crystallized
Correct Answer:

Verified
Correct Answer:
Verified
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