Question

for a sequence {tn}if sn ={n+1} then find the frist three terms of {tn}

Answer 1

hello Kunal

here is your solution



here given
Sn = n + 1

To find the first three term

let n = 1

>>>>>>>>>> S1 = 1 + 1 = 2

Hence the first term "a" = 2

Now Let n = 2

>>>>>>>>>>>S2 = 2 + 1 = 3

Since we know that Sn is the sum of term there fore S2 means it's sum of two terms

therefore to get the 2nd term;

S2 - a = 3 - 2 = 1

Now we got two terms I.e 2, 1

We can calculate our common difference

d = a2 - a1 >>> d = 1 - 2 = -1

hence the required three terms are

2, 1 and 0

hope it helps
#jerri