[43th Bcs Preliminary : 2021]
1. ২৪
2. ২৫
3. ৩০
4. ৬০
1. 1/4
2. 1/3
3. 1/2
4. 1
1. S∞ = \(20\over3\)
2. S∞ = \(3\over20\)
3. S∞ = 20
4. S∞ = 3
1. {φ}
2. {1}
3. {-1}
4. {2}
1. 1/8
2. 1/6
3. 1/4
4. 1/2