Question

Hiw many 3 digit numbers can be formed whose unit dihit is a orime number

Answer 1

Answer:

271. How many 3-digit numbers begin with a prime digit and end with another prime digit?

(A) 16

(B) 32

(C) 80

(D) 120

(E) 160

Unit place and hundredth place digit can be any of 2,3,5 and 7 and tenth place digit can be any of 0 to 9 , so 4∗10∗4=1604∗10∗4=160

271. How many 3-digit numbers begin with a prime digit and end with another prime digit?

(A) 16

(B) 32

(C) 80

(D) 120

(E) 160

Unit place and hundredth place digit can be any of 2,3,5 and 7 and tenth place digit can be any of 0 to 9 , so 4∗10∗4=1604∗10∗4=160

The wording of this question is quite ambiguous because one can think that "another prime digit" means different from the one used for the hundreds digit and in this case the answer would be 4*10*3=120.

Step-by-step explanation:

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