Question

Find the sum of the odd integers between 30 and 60

Answer 1

Answer:

31,33,35....59

a=31, d=2 & n=15

Sn=n/2[2a+(n-1)d]

15/2[2(31)+(15-1)(2)]

15/2(90)

15x45

=675

Hope it helps<3

Answer 2

Solution :-

Odd numbers between 30 and 60 are :- 31, 33, 35, __________ 59 .

So,

→ First term = a = 31

→ Common difference = d = 2

→ Last term = L = 59

→ Total terms = (60 - 30)/2 = 15

then,

→ Sn = (n/2)[a + L]

→ Sn = (15/2)[31 + 59]

→ Sn = (15/2) * 90

→ Sn = 15 * 45

→ Sn = 675 (Ans.)

Hence, the sum of the odd integers between 30 and 60 is 675 .

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