A) 21
B) 25
C) 20
D) 30
Correct Answer: C
Solution :
[c] In 1998, 22 rings are observed which means 11 rings of spring wood and 11 of autumn wood i.e., 11 annual rings are there. From 1998 to 2007 in 9 years, 9 more annual rings are formed hence, total number of annual rings in 2007 will be 11+9-20.You need to login to perform this action.
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