Question

the sum of first and the last term of an ap is 60 the sum of the terms of the ap is 7 20 what is n
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Answer 1

Let the n terms of the AP be x.

• sum of first and the last term of AP is 60
• sum of the terms of the AP is 720

As We know that we can find the n number of terms using Sⁿ = n/2[a+l] Formula.

→ Sⁿ = n/2[a+l]

→ 720 = x/2[60]

→ 1440 = x[60]

→1440/60 = x

→ x = 24

Hence,

The Total number of the terms in an AP will be 24.

Answer 2

Answer:

Let the n terms of the AP be x.

sum of first and the last term of AP is 60

sum of the terms of the AP is 720

As We know that we can find the n number of terms using Sⁿ = n/2[a+l] Formula.

→ Sⁿ = n/2[a+l]

→ 720 = x/2[60]

→ 1440 = x[60]

→1440/60 = x

→ x = 24

Hence,

The Total number of the terms in an AP will be 24.