Question

Sohan has forgotten his friend's seven-
digit telephone number. He remembers the
following:
The first three digits are either 635 or 674,
the telephone number is odd, and the number
nine appears once. If Sohan were to use a
trial and error process to reach his friend,
what is the minimum number of trials he has
to make before he can be certain to succeed?
(a) 1256
(b) 2430
(c) 3402
(d) 3006​

Answer 1

Answer:

1256 a)

ans

thnkx

blinkkk