Test Index

NCERT Class XI Mathematics - Permutations and Combinations - Solutions

© examsnet.com
Question : 9
Total: 41
If
1
6!
+
1
7!
 =
x
8!
 , find x
Solution:  
We have , If
1
6!
+
1
7!
 =
x
8!
 ⇒
1
6!
+
1
7×6!
 =
x
8×7×6!
⇒ 1 +
1
7
 =
x
56
 ⇒
8
7
 =
x
56
 ⇒ x =
8
7
 × 56 = 64
So, x = 64
© examsnet.com
Go to Question:
Prev Question
Next Question