Chapter 2 Sequences and Series Ex 2.1 Solutions

Maharashtra State Board 11th Maths Solutions Chapter 2 Sequences and Series Ex 2.1

(ii) 1, -5, 25, -125, ………
Solution:

(iii)
Solution:

(iv) 3, 4, 5, 6, ……
Solution:

(v) 7, 14, 21, 28, ……
Solution:

(ii) If a = , r = 3, find t₆.
Solution:

(iii) If r = -3 and t₆= 1701, find a.
Solution:

(iv) If a = , t₆= 162, find r.
Solution:

Check:
If sum of the three numbers is 21 and sum of their squares is 189, then our answer is correct.
Sum of the numbers = 12 + 6 + 3 = 21
Sum of the squares of the numbers = 12²+ 6²+ 3²
= 144 + 36 + 9
= 189
Thus, our answer is correct.

(ii) Number of mosquitoes after 10 years = 200 (1.1)¹⁰

(iii) Number of mosquitoes after n years = 200 (1.1)ⁿ

(ii) t₁= x – 6 = 10 – 6 = 4