Question

hallo friends important formulas from Arithmatic Progression ,std 10​

Answer 1

Answer:

nth term of an AP

tn = a + (n – 1)d  

where tn = nth term, a= the first term , d= common difference, n = number of terms in the sequence.

Number of terms in an AP

n= [(l-a)/d] + 1

where n = number of terms, a= the first term, l = last term, d= common difference.

Sum of first n terms in an AP

Sn = n/2 [2a + (n − 1) d] OR n/2  (a+l)

where,

a = the first term,

d= common difference,

l = tn = nth term = a + (n-1)d

Arithmetic Mean

If a, b, c are in AP, then there Arithmetic mean is

b = 1/2 (a + c

Answer 2

Step-by-step explanation:

Formula.............