Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas.

Reason R : Rainfall gradient is steep. Select your correct answer according to the coding system given below :
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Ans: a

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