Sum of 20 terms of 3 + 6 + 12 + …. Is

Sum of 20 terms of 3 + 5 + 7 + 9 + ….is

Find the sum to 8 terms of 3 + 6 + 12 + ...

Find the sum to 20 terms of 2 + 6 + 18 + .....

If the sum of n terms of G.P. 3, 6, 12,…….is 381 then find n

Find the sum of 10 terms of the G.P. 3, 6, 12,...

Find the sum of 8 terms of the GP 3, 6, 12, 24, ...

The sum of the first 10 terms of the AP: 20, 16, 12,…. Is:

Find the sum of 7 terms of the G.P. 3,6,12…

Find the sum of first: a] 13 term of AP 2, 6, 10, 14, ..... b] 20 terms of AP -6, 0, 6, 12, ...... c] 15 term of AP 18, 16, 14, .........

What is the sum of first 20 natural. numbers? b) Find the sum of .first 20 terms of 4,8 , 12,.... c) If 3 is added to each term in the above sequence, write down the algebraic expression of the new sequence. d) Find the sum of first 20 terms of the new sequence.