Chapter 4: Combinatorics and Mathematical Induction - Online Test
Q1. The number of 10 digit number that can be written by using the digits 2 and 3 is
Answer : Option B
Explaination / Solution:
Q2. If Pr stands for rPr
then the sum of the series 1 + P1 + 2P2 + 3P3
+……….+ nPn is
Answer : Option B
Explaination / Solution:
Q3. The product of first n odd natural numbers equals
Answer : Option B
Explaination / Solution:
Q4. If nC4, nC5,
nC6 are in AP the value of n can be
Answer : Option A
Explaination / Solution:
Q5. 1 + 3 + 5 + 7 +……….+ 17 is equal to
Answer : Option B
Explaination / Solution:
