MCQ: Probability - 2 - SSC CGL MCQ

First 13 whole numbers = 0 to 12
Total prime numbers = 5 (2, 3, 5, 7 and 11)

Total digits → 1, 3, 5, 7, 9 (5)
So the answer = 5 × 4 × 3 × 2 = 120

Since the first letter is R and all other 5 letters can be repeated,
E is two times.
Total arrangements

Total letters = 6
No letter is repeated.
So the answer = !6 = 6 × 5 × 4 × 3 × 2 × 1 = 720

Available digits for hundreds place = 4 (1, 2, 3 and 5)

Available digits for tens place = 4

Available digits for ones place = 3

So the answer = 4 × 4 × 3 = 48

Total cards = 52
Total Heart cards = 13
Selecting 2 Heart cards from 13

Selecting 2 cards from 52

Total digits → 1, 3, 5, 7, 9 (5)

So the answer = 5 × 4 × 3 × 2 × 1 = 120

Total letters = 7
A comes three times.

Total balls = 11
Selecting 3 balls out of 11

Selecting 3 black balls out of 6

Total vowels = 2
Total letters = 5

Total balls = 6 + 4 = 10
Total white balls = 4
Selecting 2 white balls from four

Selecting 2 white balls from ten

Using options:
Option A:

Option B:

Since I is the first letter the last letter,
The remaining three letters ‘N, D and A’ will shuffle.
So the answer = !3 = 3 × 2 × 1 = 6

Total letters = 6
E comes two times.

Only 2 can be used for hundreds place.
Any of the remaining 4 digits can be used at tens place.
Any of the remaining 3 digits can be used at ones place.
So the answer = 1 × 4 × 3 = 12