Question

the first term of an A. P is 5 ,the last term is 45 and the sum of their terms is 125.Find the number of terms?​

Answer 1

Answer:

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Answer 2

Answer:

first term i.e, a=5

last term i.e, an=45

sum of all terms i.e, an=125

we can expand the last term as

a+(n-1)d=45

then sn=125

n/2*(a+a+(n-1)d)=125

n(5+45)=2*125

50n=250

n=5

The total no. of terms in the A.P is 5

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