10. If the last term of the AP 5.3.1.-1...is -41, then the AP consists of
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10. If the last term of the AP 5.3.1.-1...is -41, then the AP consists of
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Answer:
here the 1st term a=5
co mmon difference d=3-5= -2
let -41 is the nth term
then,
a+(n-1).d= -41
=> 5+(n-1).(-2)= -41
=> (n-1)(-2)= -41-5= -46
=> n-1= -46/-2
=> n-1=23
=> n=23+1
=> n=24
so, the series consist of 24 terms