Question

plz solve fast 2+3+5+6+8+9+upto 20 terms is

Answer 1

Answer:

Answer: The next number in the sequence: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,... is 11. Let's observe the pattern. Explanation: The given sequence is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

Answer 2

Answer:

3n2+2n

Observe the sequence and note that every third term is missing.

Now split this whole summation as summation of two series which are in AP

Series 1 : a=2,d=3 and n terms

Series 2 : a=3,d=3 and n terms

Summation of n terms in an AP is given by 2n(2a+(n−1)d)

Using that formula, we have

2n(2×2+(n−1)3)+2n(2×3+(n−1)3)

=3n2+2n