Question

Sum of first 55 terms in an AP is 3300 , find ots 28 term

Answer 1

here's the answer to ur question

Answer 2

n = 28
a = a
d = d
T28 = ?
Tn = a+(n-1)d
T28 = a+(27)d
T28 = a + 27d






Sn = n/2[2a + (n-1)d)

S55 = 55/2[2a + (54)d]

3300 = 55/2[2a+54d]

3300 = 55/2×2[a+27]

3300 = 55[a + 27]

3300 = 55× T28. (cause T28 = a+27d)

3300/55 = T28

60 = T28

so 28 th term is 60