Question

3,15,27,39 find the 25th term of ap​

Answer 1

Answer:

a = 3

d= 12

n= 39

Sn=S25

put in formula.

u will get ur answer

Answer 2

Answer:

291

Step-by-step explanation:

3,15,27,39 what is the 25th term?

Observations:-

Difference is 12 between each term

We can use the formula used in 10th NCERT

a + (n-1)d   [Where n is term we need to find out and a is the initial term]

a = 3

d = 12

n = 25  [25 is the term we need to find]

Operation:-

apply the formula a + (n-1)d  

where, a=3 and d=12

3 + (24)12    [24*12=288]

3 + 288

291

Conclusion:-

291 is the 25th term of the A.P(sequence)

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