Krishna
0



Step 1: Identify the first term in the sequence, call this number a.


Step 2: Calculate the common difference(d) of the sequence.

[NOTE: Then Common difference = Succeeding(a+2d) - Preceding(a+d) term = d]


Step 3: Find the term position ( n )


[EXAMPLE: 2,4,6,8,10….in AP

First term 2, term position (n) = 1

Second term 4, term position (n) = 2........

......... 30th term, term position (n) = 30....... ]


The first annual allowance he has received in 11th birthday. we have to find the 18th birthday allowance so the n = 18 - 11 = 7th term



Step 4: Substitute all the values in the arithmetic formula

[FORMULA: Tn = a + (n - 1) d,

where Tn = nth term and a = first term. Here d = common difference, n = term position.]


Step 5: Solve for unknown value.