Question

22
(a) What is the sum of first 20 natural numbers
(b) Find the sum of first 20 terms of the sequence 5, 10, 15, --
(C) If 3 is added to each term of the sequence write its algebrand form
(d) Find the sum of first 20 terms of the new sequence
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Answer 1

Answer:

a = 210

Step-by-step explanation:

a = 1, d = 1

Therefore,

s20 = 20/2(2×1+(20-1)1)

s20 = 10(2+19)

s20 = 10 × 21

s20 = 210

Answer 2

Answer:

natural number are those which we can count like this

1,2,3,4