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Ratnakant Dalvi from Loyola high school , Margaon, Goa

Subject :IMO Class : Class 6

How many numbers lie between 300 and 400 in which 4 comes only one time ?

(A) 18

(B) 19

(D) 20

Ans 1:

sanjaya from v.s. v, sunabeda

Class : Class 6

answer is a bit 18