Question

1+3+5+7_+49 what should be the answer

Answer 1

Answer:

Step-by-step explanation:

a = 1 , d = 2 last term = 49.

nth term of AP = a + (n - 1)d = 49

1 + (n - 1)2 = 49

2n - 2 + 1 = 49

2n = 50

n = 25.

Thus 49 is the 25th term,

Sum to n terms is given as Sₙ = n/2[2a + (n - 1)d]

S₂₅ = 25/2[2*1 + (25 - 1)2] = 25/2[2 + 48] = 25/2 * 50

      = 625.

Answer 2

Step-by-step explanation:

a=1 ;d=2 ;

Last term =49

An=a+(n-1)d

49=1+(n-1)2

n=25

sum Sn= n*(a+l)/2

Sn= 25*25=625