Question

1,3,5,7,9,11,13......
1.Write the first term(a) andthe common difference(d)
2.Find the 8th term
3.Which term is 7?
4.Find the sum of the first 4th term
5.Find the sum of 2nd to 5th term.
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Answer 1

1 , 3 , 5 , 7 , 9 , 11 , 13

⚡Write the first term (a) and the

common difference (d)

Solution:

a1 = a = 1

d = a2 - a1

d = 3 - 1

d = 2

⚡Find 8th term ?

Solution:

a8 = a + 7d

a8 = 1 + 7(2)

a8 = 1 + 14

a8 = 15

⚡ Which term is 7 ?

Solution:

a4 or 4th term is 7.

⚡Find the sum of first 4 terms .

Solution:

Sn = n/2 {2a + (n - 1)d}

S4 = 4/2 {2(1) + (4 - 1)2}

S4 = 2 {2 + 6}

S4 = 2{8}

S4 = 16