how many terms are in this a.p 70,63,56,49 step by step
Answers
Given:-
A.P. are is in the 70, 63, 56, 49.
Last term = 21
First term = 70
Common difference= (70-63) = -7
To find:-
Which term of the given A.P. is 21 = ?
Find:-
Let the first term be a and common difference be d and last term be l.
First term(a) = 70
Common difference(d) = (70-63)= -7
We know that,
L = a + (n-1)d
=>21= 70 + (n-1)(-7)
=>21 = 70 -7n+7
=>21 = 77- 7n
=>7n= 77-21
=>7n = 56
=>n = 8
Hence its 8th term will be 21.
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Answer:
total of 11 terms inn the sequence
If u ask till 0 there are 7 terms after 49
if it will be in negative integers there are countless terms in sequence
Step-by-step explanation:
0 = 49 + (n-1)(-7) ____ [0 is the last term]
=> -49 = -7(n-1)
=> 7 = n-1
=> n = 8
That means if 49 is the first term, there are 7 other terms till 0
So, from 70, if u count there are 3 + 8 = 11 terms
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