Question

if Sum of Nth term of an AP is 1250. if d is given as 5. if the first term is 10. find last term of an AP​

Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

Sum of n terms = 1250

d = 5  

a = 10

Last term of A.P is = n

Last term = an

an = a + (n-1)d

an = 10+(n-1)d---------------(i)

Formula for sum of n terms = n/2[2a+(n-1)d]

Therefore 1250 = n/2[20+(n-1)5]

2500 = n[20+5n-5]

2500 = n[15+5n]

2500 = 15n-15n^2

15n^2-15n+2500 = 0 --------------- Quadratic equation

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