Question

if the first and last terms of AP are 10 and 15 respectively. what will be the number of terms in it if their sum is 125​

Answer 1

Step-by-step explanation:

given.

a=10,

l=15,

Sn=125,n=?

answer,

sn=n/2(a+l)

125×2=n(10+15),

250=n(25)

250/25=n

10=n

number of terms is equal to 10

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Answer 2

Step-by-step explanation:
given.
a=10,
l=15,
Sn=125,n=?
answer,
sn=n/2(a+l)
125×2=n(10+15),
250=n(25)
250/25=n
10=n
number of terms is equal to 10
if