Discuss Forum
1. 3.2n - 4.2n-2 = কত?
- A. 2n + 1
- B. 2n + 1
- C. 2n + 1
- D. 2n + 1
Answer: Option A
Explanation:
3.2^n−4.2^(n−2)
=3.2^n−2^2.2^(n−2)
=3.2^n−2^(2+n−2)
=3.2^n−2^n
=2^n(3−1)
=2^n.2
=2^(n+1)
=3.2^n−2^2.2^(n−2)
=3.2^n−2^(2+n−2)
=3.2^n−2^n
=2^n(3−1)
=2^n.2
=2^(n+1)
Post your comments here: