Arun
Last Activity: 5 Years ago
Dear student
I – 1
N – 3
D – 2
E – 3
P – 1
T – 1
for selecting 5 letters
3 alike 2 alike + 3 alike 1 diff 1 diff + 2 alike 2 alike 1 diff + 2 alike 1 diff 1 diff 1diff + all diff
2C1 * 1 + 3C1 * 5C2 + 3C2 * 4C1 + 3C1 * 5C3 + 6C5
= 2 + 30 + 12 + 30 + 6 = 80