Question

how to know whether that it the value of tn or n and how to know it the value Sn or n (3rd lesson A.P)​

Answer 1

Answer:

tn representss the value of n

n is the number of sequence

like I say what would be the 5th number of the sequence

so n = 5

now i say that 5th value of sequence is 40 so

t5 = 40

formula is

tn = a + (n-1)d

where tn = nth term

a = first term

n = number of sequence

d = difference

Sn represents sum of sequence