107. If operation $ is defined as
$X = X + 2 if X is even
$X = X - 1 if X is odd,
what is $(...$($($(15)))...) 99 times?
(A) 120
(B) 180
(C) 210
(D) 225
(E) 250
Soln: $15 gives 14
After that it is an AP with d=2, a=14 and n =99
why n is 99 and not 98
$X = X + 2 if X is even
$X = X - 1 if X is odd,
what is $(...$($($(15)))...) 99 times?
(A) 120
(B) 180
(C) 210
(D) 225
(E) 250
Soln: $15 gives 14
After that it is an AP with d=2, a=14 and n =99
why n is 99 and not 98
